Add dalli
Update rspec
Setup cache stores

Default to dalli and use memory store when testing
Cache assignments responses for 1 week
Cache zonar bus locations for 60 seconds
Small Gemfile cleanup

Move jquery-rails to assets group and haml to global grouping
Add memcachier
Remove factory_girl

Stubbing API responses using factory_girl did not pan out as
anticipated.
Load font from secure URL
Remove redundant @import
Use asset-url sass helper