Added parse rule for comparison expressions
Added type checking of comparison expression
Adapted tests for new ComparisonExpr node
Added proper evaluation of resulting type of comparison expressions instead of always returning bool
Fixed DyncheckTransformVisitor for comparison expressions and related bugs.
Removed remaining code associated with OpExpr for 'in' and 'is' operators, which were are handled by ComparisonExpr
Added tests for chain comparison expresions
Removed transform code for comparison expresions
Made code parsable by mypy
Replaced overload with Union type in os/path module
Replaced bytes/str with AnyStr
Fixed: ConstraintBuilderVisitor created contraint always in SUPERTYPE direction for type vars
Made local type vars in typing.py stubs private
Renamed all remaining local type vars to start with an underscore
Merge pull request #455 from spkersten/privstub452

Made local type vars in stubs private
Merge pull request #439 from spkersten/parsecomp

Comparison chaining
Merge branch 'context360' of https://github.com/spkersten/mypy into spkersten-context360
Whitespace changes only
Fixes to solving constraints
Improve docstring slightly