Stringify time since last note update properly

Evernote uses a convention here that is not the same as rails's
time_ago_in_words method
Generate skeleton for the notes api controller
Setup Notes#index api route
Define notes#show api action/view
Move some helper functions in to the notes helper
Define all remaining actions for notes api

Destroy, update, and create.
Send a success message in api responses on destroy
Slight reorganization of routes

For aesthetic reasons only. Shouldn't change any actual functionality.
Generate tags api controller skeleton
Setup tags api actions and views