Fix typo and add note about node 4 compat
Fix typo and add note about node 4 compat

martndemus/ember-cli-font-awesome,lfridael/ember-cli-font-awesome,martndemus/ember-font-awesome,lfridael/ember-cli-font-awesome,martndemus/ember-cli-font-awesome,martndemus/ember-font-awesome