Specify Ruby 1.9.3 or greater

The exception_notification gem requires Ruby version >= 1.9.3.
Apply subsidies to minimum costs
Apply subsidies when adjusting minimum costs in the UI

Includes a coffeescript conversion
Remove duplicate code and add parens to clarify intent
Extract helper and convert to 1.9 hash syntax
Add space before '=' for consistency
Remove dead code
Rename method
Add parens to clarify intent
Merge pull request #129 from tablexi/subsidize-minimums

Apply subsidies to minimum costs