Externalize AWS config

Merge pull request erikvanbrakel#32 from g-wattz/patch-1

fix typo

Merge pull request erikvanbrakel#26 from erikvanbrakel/make-http-sour…

…ce-updatable

Make http source updatable

Merge pull request erikvanbrakel#16 from erikvanbrakel/add-category-t…

…o-http-source

Add source category to http source

Bump go version on deploy.

Merge pull request erikvanbrakel#9 from erikvanbrakel/update-to-tf-0-9-0

Update terraform refs to v0.9.0-beta1

Merge pull request erikvanbrakel#8 from erikvanbrakel/add-polling-source

Add polling source

Fix travis