Simpler .ruby-version
Add a 'manage planes' link next to the 'planes' dropdown on new/edit form for entries
Consistent use of tabs for indentation instead of a mix of tabs and spaces
Update to Ruby 2.1.2
Upgrade to Rails 4.1
Update database.yml
Re-add jquery-rails gem
Remove unwanted stylesheets
Clean up PlanesController
Use strong params for PlanesController
Clean up EntriesController
Use strong params for EntriesController
Add styles
Calculate and display sums
Improve appearance of 'totals' row
Allow entries to be added via a form at the bottom of the index