diff --git a/.travis.yml b/.travis.yml
index fa96bc75b..6b0409547 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,7 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
   - hhvm
   - 5.6
 
diff --git a/doc/articles/aliases.md b/doc/articles/aliases.md
index 26a9c46ab..9e8f3da89 100644
--- a/doc/articles/aliases.md
+++ b/doc/articles/aliases.md
@@ -7,7 +7,7 @@
 ## Why aliases?
 
 When you are using a VCS repository, you will only get comparable versions for
-branches that look like versions, such as `2.0`. For your `master` branch, you
+branches that look like versions, such as `2.0` or `2.0.x`. For your `master` branch, you
 will get a `dev-master` version. For your `bugfix` branch, you will get a
 `dev-bugfix` version.
 
diff --git a/doc/articles/troubleshooting.md b/doc/articles/troubleshooting.md
index 2fc7bb487..fc9faa8d5 100644
--- a/doc/articles/troubleshooting.md
+++ b/doc/articles/troubleshooting.md
@@ -118,3 +118,22 @@ your GitHub account and to solve this issue you need to:
 2. Add it to the configuration running `composer config -g github-oauth.github.com <oauthtoken>`
 
 Now Composer should install/update without asking for authentication.
+
+## proc_open(): fork failed errors
+If composer shows proc_open() fork failed on some commands:
+
+    PHP Fatal error: Uncaught exception 'ErrorException' with message 'proc_open(): fork failed - Cannot allocate memory' in phar
+
+This could be happening because the VPS runs out of memory and has no Swap space enabled.
+
+    [root@my_tiny_vps htdocs]# free -m
+    total used free shared buffers cached
+    Mem: 2048 357 1690 0 0 237
+    -/+ buffers/cache: 119 1928
+    Swap: 0 0 0
+
+To enable the swap you can use for example:
+
+    /bin/dd if=/dev/zero of=/var/swap.1 bs=1M count=1024
+    /sbin/mkswap /var/swap.1
+    /sbin/swapon /var/swap.1
diff --git a/src/Composer/Installer.php b/src/Composer/Installer.php
index e1dbd496f..4e4502dfe 100644
--- a/src/Composer/Installer.php
+++ b/src/Composer/Installer.php
@@ -105,6 +105,11 @@ class Installer
     protected $verbose = false;
     protected $update = false;
     protected $runScripts = true;
+    /**
+     * Array of package names/globs flagged for update
+     *
+     * @var array|null
+     */
     protected $updateWhitelist = null;
     protected $whitelistDependencies = false;
 
@@ -785,9 +790,8 @@ class Installer
         }
 
         foreach ($this->updateWhitelist as $whiteListedPattern => $void) {
-            $cleanedWhiteListedPattern = str_replace('\\*', '.*', preg_quote($whiteListedPattern));
-
-            if (preg_match("{^".$cleanedWhiteListedPattern."$}i", $package->getName())) {
+            $patternRegexp = $this->packageNameToRegexp($whiteListedPattern);
+            if (preg_match($patternRegexp, $package->getName())) {
                 return true;
             }
         }
@@ -795,6 +799,19 @@ class Installer
         return false;
     }
 
+    /**
+     * Build a regexp from a package name, expanding * globs as required
+     *
+     * @param string $whiteListedPattern
+     * @return string
+     */
+    private function packageNameToRegexp($whiteListedPattern)
+    {
+        $cleanedWhiteListedPattern = str_replace('\\*', '.*', preg_quote($whiteListedPattern));
+
+        return "{^" . $cleanedWhiteListedPattern . "$}i";
+    }
+
     private function extractPlatformRequirements($links)
     {
         $platformReqs = array();
@@ -844,11 +861,27 @@ class Installer
 
         $seen = array();
 
+        $rootRequiredPackageNames = array_keys($rootRequires);
+
         foreach ($this->updateWhitelist as $packageName => $void) {
             $packageQueue = new \SplQueue;
 
             $depPackages = $pool->whatProvides($packageName);
-            if (count($depPackages) == 0 && !in_array($packageName, $requiredPackageNames) && !in_array($packageName, array('nothing', 'lock'))) {
+
+            $nameMatchesRequiredPackage = in_array($packageName, $requiredPackageNames, true);
+
+            // check if the name is a glob pattern that did not match directly
+            if (!$nameMatchesRequiredPackage) {
+                $whitelistPatternRegexp = $this->packageNameToRegexp($packageName);
+                foreach ($rootRequiredPackageNames as $rootRequiredPackageName) {
+                    if (preg_match($whitelistPatternRegexp, $rootRequiredPackageName)) {
+                        $nameMatchesRequiredPackage = true;
+                        break;
+                    }
+                }
+            }
+
+            if (count($depPackages) == 0 && !$nameMatchesRequiredPackage && !in_array($packageName, array('nothing', 'lock'))) {
                 $this->io->write('<warning>Package "' . $packageName . '" listed for update is not installed. Ignoring.</warning>');
             }
 
diff --git a/src/Composer/Package/Loader/RootPackageLoader.php b/src/Composer/Package/Loader/RootPackageLoader.php
index 2dc4e220d..f177f8eab 100644
--- a/src/Composer/Package/Loader/RootPackageLoader.php
+++ b/src/Composer/Package/Loader/RootPackageLoader.php
@@ -210,7 +210,7 @@ class RootPackageLoader extends ArrayLoader
 
             // find current branch and collect all branch names
             foreach ($this->process->splitLines($output) as $branch) {
-                if ($branch && preg_match('{^(?:\* ) *(\(no branch\)|\(detached from [a-f0-9]+\)|\S+) *([a-f0-9]+) .*$}', $branch, $match)) {
+                if ($branch && preg_match('{^(?:\* ) *(\(no branch\)|\(detached from \S+\)|\S+) *([a-f0-9]+) .*$}', $branch, $match)) {
                     if ($match[1] === '(no branch)' || substr($match[1], 0, 10) === '(detached ') {
                         $version = 'dev-'.$match[2];
                         $isFeatureBranch = true;