ignore rubymine files
include debugger in Gemfile
include db/schema.rb
Fix team creation

Due to an error in the whitelist for strong_parameters it was not
possible to save a team with an associated mutant.
Fix updating teams

Due to a mistake in the team_controller's strong_parameters config
nested resources' IDs have been filtered out. Thus whenever the user
tries to update a team, the nested resources get duplicated.
Merge pull request #1 from b4mboo/review_140514_strong_parameters_fixes

strong_parameters fixes