numpy: first pass to supports numpy

Numpy requires severals requirements:
- It absolutely requires unittest, that was deleted before
(reduce-python.sh)
- It requires future_builtins (ModuleSetup)
- Deduplication of symbols now can merge multiple .a for easier
management in Xcode (tools/environments.sh)
- Avoid passing specific linker parameters to ar (-Wl ignored in
tools/liblink).

Numpy itself have few patch for:
- force endianess to be little, using directly endian.h leads to
detection error during the build process.
- force not BLAS to be built, Accelerate framework already have it
- rework the dependencies relation for lapack_lite and _umath_linalg,
to prevent duplicate symbols and force compilation of necessary module
/ missing symbols.
remove invalid bridge.m/h ignore
Merge pull request #108 from kivy/support-numpy

Numpy support / recipe