Update test on transaction.
Add categories after creation.
Refactor tests, model and controller for transaction.
Test that categories are added on creation.
Change categories.
Merge branch 'topic/finalizeCategories' into develop

* topic/finalizeCategories:
  Change categories.
  Test that categories are added on creation.
  Refactor tests, model and controller for transaction.
  Add categories after creation.
  Update test on transaction.
Complete tests on comptes helper.
Complete tests on comptes and correct tests (then failed without capybara).
Complete tests on transaction.
Adds ids to main layout elements.
Create a button to set sign of the operation.
Finalize +/- button.
Merge branch 'topic/addSignInForm' into develop

* topic/addSignInForm:
  Finalize +/- button.
  Create a button to set sign of the operation.
  Adds ids to main layout elements.
  Complete tests on transaction.
  Complete tests on comptes and correct tests (then failed without capybara).
  Complete tests on comptes helper.
Move last transaction first entry in the table.
Merge branch 'topic/moveLastTransactionUp' into develop

* topic/moveLastTransactionUp:
  Move last transaction first entry in the table.
Improve configuration of guard.
Replace unit tests by feature tests (clearer).
Move format_amount tests to feature tests.
Move all tests on multiple values as features.
Prepare guard and spork for cucumber.