Reverts git-flow settings, fixes release steps. Refs #23.
Updates generated C code. Refs #27.

Using nimrod compiler at cf81177c407559ce45fa06a20ed91e56ede6aaff.
Updates generated code with patched _NSGetEnviron. Refs #27.

Line 1092 from nimrod's lib/pure/os.nim has to be removed.
Documents compilation and binary compatibility. Refs #27.
Merge branch 'feature/t27_fix_environ'