Update .travis.yml

Allow external
Documentation for release 2.0, and website rewritten from scratch
Documentation for release 2.0, and website rewritten from scratch
Some fixes
Corrections & formatting
Merge pull request #957 from quamilek/develop

Bumped version
Moar documentation
DonPedro files added with some minimal description
Merge branch 'develop' of https://github.com/allegro/ralph into release/2.0.0-stable
Merge
bumped django-pluggable-apps version to 1.2
Spaces
Spaces
Spaces
Reformatted.
Merge pull request #960 from vi4m/release/2.0.0-stable

Release/2.0.0 stable
merge
Merge pull request #962 from mkurek/bump-django-pluggable-apps

bumped django-pluggable-apps version to 1.2
Allowed to use IP addresses that exist but are not bound to device
Stable is better than unstable