ID Consistency: Go Back to _id

Closes #85
Merge pull request #86 from keelerm84/feature/issue-85

ID Consistency: Go Back to _id
Add tagline to user model
Expose tagline in sanitized user records
Return emailHash with user records
Allow user route query of featured and role
Create user service
Provide RSS feed for News, Events and Resources

Closes #56
Merge pull request #88 from keelerm84/feature/issue-56-provide-rss

Provide RSS feed for News, Events and Resources
Enhance Tags API and Model

+ Flesh out express API for Tags
+ Provide static method findOrCreate on model
+ Add name_upper field to Tags for case insensitive searching
Merge pull request #89 from jacobwalker0814/tags-api

Enhance Tags API and Model
All tests passing, failed tests fail CI

+ Make grunt "force" conditional
+ Fix callbacks so we don't call "done" before we're done saving
+ Drop duplicate keys when ensuring index on username
Merge pull request #90 from jacobwalker0814/fix-testing

All tests passing, failed tests fail CI
Placeholder for mockup html / css.

Place everything under /public/mockup until it is merged in to the
actual FS structure.
Added layout files for frontend
Started adding mockup folder elements into public folder.
Moved folders from mockup into public folder.
Kept working on the libraries and the head/footer and main index file
Layout tweaks

* Bring Sign Up / Sign In up in to the main nav bar
* Add document.ready wrapper to main.js
* Remove menu generation from header.js
Fix scroll-spy effect for top nav bar