Fixed some typos, noted simpler require syntax, changed link to Sunlight Foundation since Labs site is deprecated
Tweaked error messages and fixed typos
Merge pull request #7 from sunlightlabs/master

Fixing some language and typos
Merge branch 'master' of https://github.com/mcwhittemore/sunlight-congress-api into 0.0.3
basic query function added to the core section