support Class.new()

Add test cases for Hash

X code native target, follow up of #184

Remove not used ary_reverse

Add string test for string interpolation

fixed prototype warning (-Wstrict-prototypes)

fixed prototype: g++ will complain about definition not being a prototype, should work with GCC and VC as well

fixed prototype: g++ will complain about definition not being a prototype, should work with GCC and VC as well

fixed const_get && const_missing issue

Could you add me to AUTHORS?

'mrb_sym' used as 'uint32_t'. it's broken portability; based on the work from @crimsonwoods; close #216