add bower support

[szelga]

i've made bower.json file, adding django-omnibus to bower repository is up to project maintainers.

[coveralls]

Coverage remained the same when pulling 4b3c1c6 on szelga:bower into 93bfcd7 on moccu:master.

[EnTeQuAk]

Hey @szelga, thanks a lot for the pull request.

After thinking about this I'm not sure if a loose-coupling like this actually works. What would be the advantage of releasing this for bower?

[szelga]

it would be nice in a situation when you use asset compiler like brunch, grunt or gulp with bower. as for brunch (which i use) it's not that critical for brunch, because it "extends" bower.json syntax with "overrides". i don't know what's the situation for other asset compilers though.