#71 Support dynamic ENV constants like PHP_VERSION
#71 Create code for next support of magic constants
#71 Support new magic constant __CLASS__
#71 Support new magic constant __METHOD__
#71 Support new magic constant __NAMESPACE__
#71 Support new magic constant __FUNCTION__ and fix __METHOD__
Constants write code for support expectingVariable [Failed]
Fix ZEPHIR_GET_CONSTANT macros [thx sjinks for help]
Merge pull request #72 from zaets28rus/constants

#71 Support dynamic ENV constants like PHP_VERSION and Magic __CLASS__, __METHOD__, __NAMESPACE__, __FUNCTION__