Pythran 0.6 - PyConFR

Read the Changelog :-)
Merge pull request #341 from serge-sans-paille/0.6

Pythran 0.6 - PyConFR
Precompute some types
Remove unused value in Attribute Intrinsic.
Remove tables.modules to tables.MODULES to avoid confusing local/globals
Show compilation time in bench
Add documentation for typing and remove dead code
Rework typing conversion
Use introspection for literals typing