Corrected settings for the phpcsmd NetBeans IDE plugin.
Added CONTRIBUTING.md file.
Moved mock classes to dedicated directory.
Updated required PHP version to 5.4.
Removed unnecessary composer.lock file (no dependencies yet).
Updated example class.
Fixed class name in DocBlock comments.
Removed unnecessary method doEqualityComparison (the client should override the method equals).
Enhanced test case.
Added static method isNotEqual.