Firs step of D/Objective-C merged

[Jacob Carlborg via Digitalmars-d-announce]

I just manged to get all tests passing on all platforms. Now the first 
step of D/Objective-C has been merged [1][2]. The only thing that's 
supported for now is calling Objective-C instance methods from D.

I want to give special thanks to Michel Fortin who did the original 
implementation. I also want to thank Walter, Daniel and all others who 
reviewed the code.

Thank you.

[1] 
https://github.com/D-Programming-Language/dmd/commit/941808dc44a03396d41657cfa9ccc8bfe901f3a7

[2] 
https://github.com/D-Programming-Language/druntime/commit/b50096fdbe425e32b4edf1341369434a57a63b31

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/Jacob Carlborg