Check mode arguments for benchmarks
Add randomness in benchmarks execution order
Change default compiler flags for benchmarks
Merge pull request #281 from pbrunet/bench

Bench
Rework pythran import transformation for future submodule support
Accept submodule function
Add os.path submodules.

So that submodules can be tested
Remove useless files

* Duplicate from pythran/pythonic/__dict__/fromkeys.hpp