restricted types of itertools stubs
fixed incorrect restrictions
fixed output of product to Iterator[Sequence[T]]
fixed input type of product, and added note about type sig
Fix typo in encodings stubs

Fixes #369.
Fix importing mypy.codec.pytokenize in Python 3

Closes #370.
Move mypy/codec/example.py to samples/codec/example.py

The custom coding was causing all kinds of trouble during installation.
Merge pull request #358 from mvcisback/itertools

Restrict types for stubs in itertools
Added .travis.yml
Add build status to README
Remove logic for running a file after translation

Bug #373
Add a arrow symbol (->) to the lexer
Add a arrow symbol (->) to the lexer

Bug #368
Add a test for the arrow operator

Bug #386
Rename test function
When parsing type, expect a single '->' token
Make sure test failures are tracked
PEP 8 fixes for build.py
PEP 8 fixes for cgen.py
PEP 8 fixes for checker.py