Release 0.4.1-alpha

Dynamic object property update
Some fixes in TernaryOperator
Separate LetStatement to files in Statements\Let directory
Updating static property indexes
Added support for abstract modifier for methods
Added new types: object, resource, callable
Disable pregmatch* optimizer
Added fork json-c as submodule
Readme move build img to svg format
Added support for SplHeap, SplMinHeap, SplMaxHeap
Nested namespaces support

Added more anothers fixes and review for core
Happy coding with Zephir ^_^