enable parsing of UTF-encoded documents with Byte Order Marks fix sal…

…sify#36

Merge pull request salsify#41 from MAXakaWIZARD/pr-version-6.0

Version 6.0 (PSR-2 and big refactoring)

Merge pull request salsify#39 from MAXakaWIZARD/pr-parser-stop

Implement Parser::stop method close salsify#38

fix large integers fix salsify#34

remove call_user_func

added new method for whitespace; interface not backwards compatible

version 2.0.

version 1.0. starting to use semantic versioning; major versions repr…

…esent breaks in API compatibility