Merge pull request #95 from joker-eph/numpy_simplified

Fix compilation issues (NT2, Clang,...)
Begin ExtSlice support

Conflicts:
	pythran/typing.py
Merge branch 'numpy_simplified' of github.com:serge-sans-paille/pythran into numpy_simplified
Fix include path
More extslice support
Fix bad extslice typing

validation OK @ home
Validated version of ExtSLice
PEP8 compliance

Automate pep8 checking by adding a few test cases that check if PEP8 is
respected throughout pythran code base.
More efficient ExtSlice
Revert "Fix nt2 include path"

This reverts commit 61cfa150a0222361593f6806f9e6d0ae56b12554.
A few bug fixes later
numpy.allclose(): check for nan explicitely