proper syntax for loading of libraries with numbers in their names

Example:

    {% load bootstrap3 %}

You'd end up with:

![screen shot 2014-08-02 at 7 13 17 am](https://cloud.githubusercontent.com/assets/488182/3786175/73914d00-19d1-11e4-8904-9bbf863eeec7.png)

This should fix that.