Fix #502 about abstract classes use interface methods
Updated
Removed "abstract" duplication in parser
Fixing comparisons, using identifiers as class constants
Merge pull request #514 from nkt/fix/typo-in-parser

Removed "abstract" duplication in parser
Merge pull request #503 from dreamsxin/502

Fix #502 about abstract classes use interface methods
Adding license badge
Allow to use 'zend' as namespace