Update to django 1.5

## Changes
changed twittenario/requirements.tx to add django 1.5.1
add new config Allowed-Hosts. [more](https://docs.djangoproject.com/en/dev/ref/settings/#allowed-hosts)
changed class based views in urls.py. [More](http://stackoverflow.com/questions/11428427/no-module-named-simple-error-in-django)

[close #8]