Add globals() stub
Add defs to codecs stubs
Add re.U and re.UNICODE stubs
Support iterable rvalue in multiple assignment
Fix iterable rvalue and non-trivial inheritance
Fix type inference with iterable initializer
Make io.TextIOWrapper subclass of TextIO
Fixes to io stubs
Add locals() stub
Add eval() stub
Add addCleanup method
Support 'del name'
Support 'del x.y'
Support raise with a class argument
Make invalid exception error messages clearer