Distribute in code type information

[tharvik]

So, section "Storing and distributing stub files" in PEP 484 gives a way to distribute *.pyi. But how to package a project such that it's in-code type annotations are taken in consideration by mypy? Currently, I'm just installing the *.py directly, which keep the type annotations.

Setting MYPYPATH to /usr/lib/python3.4/site-packages will make it fail, so I guess there should be a fallback if a module is not found, to look for it directly in the site-packages. Or is there a flag I missed?

[JukkaL]

We've discussed this in #1190. Is it okay to move further discussion there? I'm going to write a follow-up comment with some ideas there.