Bundle activerecord-pg_array
 Include activerecord-pg_array in Course and User models
Revert " Include activerecord-pg_array in Course and User models"

This reverts commit 0045638adc0385ac2abf638e26db96df034f20b2.
Revert "Bundle activerecord-pg_array"

This reverts commit a9362772278f5362e214967d524ae9291809d909.
Index array columns
Add skill attribute getter/setters
Rewrite seeds.rb to take into account skill attributes as arrays
Setup search routes
Rewrite users#index to search skill attributes as arrays; use Location model for geolocation
Blank search results template