Clean up minor issues with README

- Fix link to download community builds
- Remove "Welcome to" in header
- Remove "now open source" text
- Change "Download the source" to "Fork the source"
- Change Travis badge to the one directly from travis-ci.org
- Wrap prose on 80 characters
[skip ci]
Merge pull request #240 from Fryguy/cleanup_readme

Clean up minor issues with README
Add Dictionary spec
Simplify and remove unnecessary code
Refactor serializer
Move dictionary data from fixture to I18n file
Leverage I18n data for Dictionary lookups