Add regions show and index to routes and controller

* Add regions show and index to routes
* Move categories under regions in routes
* Add show and index methods to controller
Change links in ALL the places

* Previously categories was not under regions in the routes b/c branches
* Now that they are, all the links involving categories have to change
* Now hopefully all of the links are correct and working
Create regions index and show pages

* Show all regions on region index page
* Show all categories on region show page
Remove index from categories

* Indexing of categories is now covered by regions show
Move new region button to regions

* New category button is now above list of categories
* New regions button should match
* Admin page should only hand spam issues
* Only show buttons if current user is admin
* Update use of check_admin to avoid errors
Make separate method for finding regions
Put :show into array
Merge pull request #12 from elijahkim/ha-show-regions

Show regions

* Correct routes and links
* Correct placement of new regions/category buttons
* Move list of categories to region show page