simple assets model and tests added
added validation and improved tests
added user/asset association, create an asset factory, updated user and asset tests
make sure assets are deleted when user is deleted
policy for assets added
asset controller added
only admin can see users now
working asset create, index and delete
asset UI changed to look good, edit functionality added, asset_type changed to enumeration, tests updated
new expense model created, related to the previous user and asset models, factory for expense creation created, first tests on the expense model created
policy for the expenses added
expenses added to routes, capybara tests configured
expenses controller with index implemented created, rspec tests created, improved tests to support user login
expenses added