Auto merge of #98 - fitzgen:python-4-space, r=emilio
Auto merge of #98 - fitzgen:python-4-space, r=emilio

Use 4 space indentation in run-bindgen.py

Python style (PEP8) is 4 space indentation, and you'll be hard pressed
to find anything else in the python community. We should match up with
expectations, editor defaults, etc.

r? @emilio

emilio/rust-bindgen,jdub/rust-bindgen,jdub/rust-bindgen,catdesk/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen,jdub/rust-bindgen,catdesk/rust-bindgen,catdesk/rust-bindgen,catdesk/rust-bindgen,rust-lang/rust-bindgen,jdub/rust-bindgen,emilio/rust-bindgen,emilio/rust-bindgen,rust-lang/rust-bindgen