Add support for modeling unary plus, including with respect to a custom __pos__.
Merged in jwalden/mypy/unary-plus (pull request #1)

Add support for modeling unary plus, including with respect to a custom __pos__
Merged jukkaleh/mypy into master
Add build/ to .gitignore so it doesn't accidentally end up in commits.
Add basic implementation of type aliases
Fix type check errors
Fix test case
Merged jukkaleh/mypy into master
Merged in jwalden/mypy/ignore-build-dir (pull request #2)

Add build/ to .gitignore
Various stubs (WIP).
Merge branch 'master' into gvanrossum (.gitignore)

Conflicts:
	.gitignore
More stubs.
Add an unreachable flag to blocks
Add basic support for compile-time conditionals

We hardcode all defined names PY2/PY3 to be interpreted as compile-time
constants dependent on the current Python version.
Merged jukkaleh/mypy into master
Fix conditional type aliases
Add python version check test cases
Ignore *~ and @*.
Merge branch 'master' into gvanrossum
list.pop() has an optional integer argument.