Feature/style login pages

Hey there, this PR implements tracker story 67127028, [Style Account screens (Log In, etc.)](https://www.pivotaltracker.com/n/projects/890876/stories/67127028)

See the related [IOS PR](https://github.com/jmoody/wetap-ios/pull/69)
Man, I love that sass variables are hyphenated, javascript and ObjC are camel case, ruby is underscored, and css classes are hyphenated unless they are generated from ruby resource introspection, in which case they are underscored. Don't you?

At least we can all get behind two space indentation vs tabs. Right guys? Right?