Fix indentation

[sidkurella]

Entire repository uses 2 space indents instead of 4.

Per PEP8 it should be 4: https://www.python.org/dev/peps/pep-0008/#indentation

[dqu123]

@sli908 a tool like https://github.com/google/yapf might be helpful.
We're using it for the Donut rewrite, which is based off of RuddockWebsite.

[allisonkong]

Yeah, that's one of the things I disagree with PEP8 on :P

(Google also uses 2 space indents internally)

[dqu123]

@dkong1796 do you use yapf?
I used Go this summer, so I'm used to gofmt / vim-go.

[allisonkong]

No, I don't (I mostly work in C++ and Java at google)