feat(collapse): use uib- prefix

[Foxandxss]

So this is the proposal for collapse prefixing.

[Foxandxss]

@wesleycho I need you to check this out, I know you're in vacation, but if you agree, I can do a couple of this before you come back.

@icfantv you too.

[wesleycho]

LGTM

Controllers need to be prefixed too for the others - this should be a 100% breaking change I think. Thoughts?

[Foxandxss]

You're right @wesleycho, we should prefix controllers too. Will update the instructions.

This PR is not a breaking change tho, it still works as it did before. The breaking change will come when we decide to rm all the .old files.

We need somehow (for when we release 0.14 with all prefixes) to announce that we have prefixes now and that the users should update their projects ASAP.

[wesleycho]

Right, my comment was just before you delved down into the other work :) .

As for the notifying users, perhaps we can mention it on the home page and the README - the deprecation notices will serve enough warning to current users I think.

[Foxandxss]

@wesleycho Updated. Now we just need to remove from the comment to the bottom to clean the deprecated modules.

[wesleycho]

Alright, this looks better to me - good to go!