Added two new String Rivets Formatters: `includes` and `match`.
Added two new String Rivets Formatters: `includes` and `match`.

`includes` accepts a case-sensitive string needle, and will return true if that needle is found in the haystack
 `match` accepts a regexp (as a string to pass through as a Rivets argument, therefore not wrapped in / /), and an optional argument for any flags (i.e. 'i')

michaelrshannon/cartjs,discolabs/cartjs,michaelrshannon/cartjs,discolabs/cartjs