gitignore ./idea directory (Rubymine)
Add Mongoid support using alpha2 attribute
Refactorings
gitignore .idea/ directory (Rubymine)
Add flag images from CIA World Factbook (public domain) to data directory
Add GEC code method (required for flag image lookup.)  Add flag image method that returns .gif, .jpg, or base64 encoding of country's flag. Add Rake task to copy all flags to given directory. All specs pass.
Change flag_image to return filename only by default
Move gem rake tasks to lib/tasks for user use.
Remove Rake task. Add Rails engine to serve flag images from asset pipeline.
Merge branch 'feature/mongoid'
Merge branch feature/flags
Formatting. Automatically require countries/mongoid if Mongoid is defined
Update README with fuller Mongoid instructions.
Merge changes from feature/mongoid