Merge pull request #44 from till-varoquaux/master

Pub changes
bump
Merge branch 'master' of github.com:okws/okws
Remove layer_none from the environment. Pop should only be allowed to shrink the stack.
pub3: Report when access locals accross file boundaries.
Got rid of pub's `bind`, `unbind`  and scoped `lookup`
Flattened the libs lookup table in the environment...