Added URL for elements

Fixes #75
RequestInterceptor is called for getList as well now

Fixes #70
Only adding what part to the URL in case there's one.

Fixes #54
Added Restangular version support for AngularJS

Fixes #69

Adds comment regarding #71. I'll see how to fix this.
Added URL to README
Added changelog for version 0.7.0
v0.7.0