Added guard support for easier developement
Added IconHelper module with fa_icon and fa_stacked_icon helpers
Added information about the helpers to the README
Properly protected private methods in IconHelper
Moved IconHelper to default path for rails engines
Added an integration test to ensure icon helpers are loaded
Cleaned up icon helper tests
Changed method signature of fa_stacked_icon to accept :base option

New helper signature:

fa_stacked_icon "twitter", base: "check-empty"
Added support for passing other tag options to icons

e.g.
fa_icon "user", data: { id: @user.id }
# => <i class="icon-user" data-id="123"></i>
Fixed hash syntax for ruby 1.8 in icon helper tests
Merge pull request #30 from rmm5t/icon-helpers

Consider adding some icon helpers
Bumped version to v3.2.1.3
Added note to readme about helper usage in production
Merge branch 'master' of https://github.com/bokmann/font-awesome-rails
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