Performance improvement when using --filter option with large test code base: PHPUnit_Framework_TestSuite::isTestMethod is the bottleneck.
  * Now 2 times less calls from PHPUnit_Framework_TestSuite::addTestMethod
  * Only 1 call to ReflectionFunctionAbstract::getDocComment

Conflicts:
	PHPUnit/Framework/TestSuite.php
Next stable release will be PHPUnit 4
Make --self-update aware of release channels (alpha, beta, stable)
Merge remote-tracking branch 'upstream/master' into origin-master
Merge pull request #1092 from lolgzs/master

Performance improvement when using --filter option