etags: add basic support for If-Match
added return values to set methods
etag: If-Match, remove rogue console.log
etags: better operation check
Update to first example

Added some comments and tried to more simply explain the Restangular object.
Update to getting started section

Consolidated duplicate descriptions and code examples into a single quick start example. (makes it more copy and paste friendly). This way it flows right into the examples on how to use Restangular.
Update README.md

Changed order of dependencies