finalised impressions
fixed merge conflict with spareoffer page and created impressions controller and model
Merge pull request #10 from NadiDami/master

Stripe, and fixed other conflicts
Merge branch 'master' of https://github.com/RhysStansfield/deal
everything works after morning merge
impressions now also add entry to db
changed index erb to haml
added  business name to offers show page
updated post-login paths for business or user, created business dashboard page
Added Category model and category buttons on sign up form
unique impressions works
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
merged impressions with categories
Merge branch 'master' of https://github.com/RhysStansfield/deal
start timewindow views
Added avatars to .gitignore
business can now track clicks
Refactoring business.rb model and extending test coverage