Make API more ObjC-like

Rename repositoryForClassName to repositoryWithClassName.
Update API docs
Commit xcode schemes to git

This change is necessary to allow CLI build of the solution
from a fresh git clone, e.g. on Jenkins.

See http://stackoverflow.com/a/7113723/69868
Merge pull request #5 from strongloop/feature/rename-repository-methods

Rename repositoryForClassName to repositoryWithClassName