Add pep8 config, use pep8 in travis

also, fix E111-E113 errors:
E111 - indentation is not a multiple of four
E112 - expected an indented block
E113 - unexpected indentation

On Sun, Nov 30, 2014 at 11:02:50AM -0800, Aaron Meurer wrote:
>    Do these two always indicate a syntax error?

I think so.