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Fixes deprecation issues with controller specs
Fixes deprecation issues with feature specs. Removes Spork.

Spork was causing issues with Faker although most likely I did not
configure it correctly. I removed it for the time being.
Fixes deprecation issues with helper specs
Added tabindex -1 to main content div
Moved skip nav function to javascript
Merge pull request #103 from 18F/feature/fix_skip_nav_chrome_bug

Feature/fix skip nav chrome bug
Fixes remaining deprecation issues

This fixes the remaining depcrecation issues and fixes the problem with
the main cancancan repo not being updated for rspec3.
Merge pull request #101 from 18F/feature/fix_rspec_deprecations

Fixes rspec deprecations
Added basic theme switching
Added a method of theme swithcing in application_controller
Added a generic theme in the theme folder
Fixed breadcrumbs on categories index
Fixed errors with categories show template