Added Category model and category buttons on sign up form
Merge pull request #11 from HemangPatel1/master

Impressions and dashboard
added business categories to business sign up form and appropriate tables
Merging in Impressions, Unique Impressions and Business Sign Up categories
start timewindow views
Added avatars to .gitignore
Refactoring business.rb model and extending test coverage
Merging in clicks tracking from Hemang
Time Window timings
fixed conflicts with master
time windows working
Updated Gemfile
Minor tweaks to tidy up test suite and routes
Business input of Time interval with defaults
Updated Factories for testing
Merge pull request #14 from jamesjenkinsyates/master

Time Windows Working.