Added bitwise parser

Signed-off-by: Rack Lin <racklin@gmail.com>
Added bitwise operators to zephir kernel.

Signed-off-by: Rack Lin <racklin@gmail.com>
Added Bitwise Operators

Signed-off-by: Rack Lin <racklin@gmail.com>
Added bitwise operators unit tests

Signed-off-by: Rack Lin <racklin@gmail.com>
Merge pull request #102 from racklin/enhancement/bitwise

Added Bitwise Operators