Refactor to guard clauses
Attempt to improve the --help output
Closes #914
Add missing tests for assertStringMatchesFormat() and assertStringNotMatchesFormat()
Add missing test for assertJson()
Add missing test for isEmpty()
Add missing test for callback()
Add missing test for countOf()
Add missing tests for assertAttributeCount() and assertAttributeNotCount()
Fix whitespace
Add missing tests for assertAttributeInstanceOf() and assertAttributeNotInstanceOf()
Add missing tests for assertAttributeInternalType() and assertAttributeNotInternalType()
Fix whitespace
Make getStaticAttribute() and getObjectAttribute() public
Fix whitespace
Add missing tests for getStaticAttribute() and getObjectAttribute()
Initial work on nightly builds in phpunit-alpha-YYYY-MM-DD.phar and phpunit-beta-YYYY-MM-DD.phar format
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