Support for self/parent/static properties
Native functions

  * phalcon_array_is_associative()
  * phalcon-array_keys()
Merge pull request #943 from sjinks/read_class_property

[NFR] Support for self/parent/static scopes in static properties
Merge pull request #945 from sjinks/array_funcs

More native functions for arrays
Do not duplicate checks performed in phalcon_create_instance_params()