Added HHVM unit tests

Signed-off-by: Grégory PLANCHAT <g.planchat@gmail.com>
Updated Tokenizer integration tests

Signed-off-by: Grégory PLANCHAT <g.planchat@gmail.com>
Merge branch 'master' into refactoring/yielding-lexer-rules
Updated Tokenizer integration tests

Signed-off-by: Grégory PLANCHAT <g.planchat@gmail.com>
Merge branch 'master' into refactoring/yielding-lexer-rules