Fix up travis config
fix a Django >= 1.5 bug extending adminplus/base

* error shown:
  `Could not parse the remainder: ':index' from 'admin:index'. The syntax of 'url' changed in Django 1.5, see the docs.`
* adding quotes seems to fix the problem
* see http://stackoverflow.com/a/8789892/305019
Merge branch 'test-template'