Bumped r.js to 2.1.8. This also eliminates 'X is undefined' errors on IE8-10 when using sourcemaps.
Bumped r.js to 2.1.8.
This also eliminates 'X is undefined' errors on IE8-10 when using sourcemaps.

muhammad-ammar/django-require,thijstriemstra/django-require,muhammad-ammar/django-require,thijstriemstra/django-require,heroku/django-require,etianen/django-require,karolyi/django-require2,etianen/django-require,karolyi/django-require2,heroku/django-require