Capybara : poltergeist replace webkit
Controller + views v2
Add shoulda-matchers to Gemfile
Change Gemfile organization
Categories spec now use shoulda matchers
Expenses spec now use shoulda matchers
ExpenseLine spec now use shoulda matchers
ExpenseLine spec now check category presence
Gemfile : do not require cucumber
Create factories
Add #total_amount to expense
Add employee payback to expenses and expense lines
Add tax to categories factory
Categories : rename tax to tax_deductible
Add tax deduction support
Small view changes
Add viewport to layout
Add date to expenses
Add date and employee to expenses#show + presentation