do not clobber prexisting size hints
Use `pip install .` instead of requirements.txt for travis-ci.
Hopefully this catches most issues with `pip install` being broken.
Merge pull request #12 from rajbot/master

Use `pip install .` instead of requirements.txt for travis-ci.
Merge remote-tracking branch 'samuel-archive/master'
Merge branch 'master' of github.com:jjjake/ia-wrapper
Merge branch 'master' of github.com:jjjake/ia-wrapper into fast
define header_names on separate line for easier reading.