Merge pull request #1 from kevinkang88/CREATE_BLANK_ABOUT

added slim to gemfile and used slim syntax to refactor about page
added promotions controller and the index action
added active resources gem
added get promo titles method in order to get an array of titles of courses provided, created get all promos method to get parsed data in JSON object
for the index page for promotions erb was used instead of slim because it was returning the array at the end - see comments in file (line 1-6) for details
Merge pull request #2 from kevinkang88/PROMOTIONS

Promotions