Profiles made completely public.

Fixes #5

Refactor ApplicationHelper.navigation_items to work for both signed in and signed out users
Remove HomeHelper since navigation is handled by ApplicationHelper
Add guest abilities for signed out users
Use exposed profile and current_tag to build page title
Add tests for signed in and signed out navigation items
Update specs to have signed out requests be successful instead of redirecting
Remove authenticate user before filter from controllers
Only fire refresh gist before filter when a user is signed in
Refactor MyGists::Cache spec by mocking Rails.cache
View cleanup by highlighting and bolding 'gists' and tag names
When a user searches for a profile which does not exist, make sure no gists are found
Add tag tooltip to search view

simeonwillbanks / mygists