Test Object::__toString().
delete unused method in TObjectsComparator
add a test for parseTypeComment with empty string
corrects a misspelling
rearrange the order of a switch
modification of a method call in tests.

assertSame(null, ...) becomes assertNull(...)
Modify ClassLoaderTest to be sure the ClassLoader is register in the spl autoload stack.
Merge branch 'phpUnit'