Added JsonEncodeOptimizer and JsonDecodeOptimizer. Use PHP internal php_json_encode/php_json_decode implements not userland function call.

Signed-off-by: Rack Lin <racklin@gmail.com>
Adding 'build' command, fixing bugs
Adding extra comparison macros for doubles [ci skip]
Merge pull request #78 from racklin/enhancement/json

Added JsonEncodeOptimizer and JsonDecodeOptimizer. Use PHP internal php_...
Merge remote-tracking branch 'upstream/master'

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

Conflicts:
	ext/test/json.c
	unit-tests/json.php