Update event-loop constraint to 0.3.*

[Andrewpk]

React event-loop is at 0.3.* now.

[nrk]

I pushed a new branch to test the needed changes after bumping the required version of react/event-loop. Can you double check that everything works for you too?

[Andrewpk]

I replied yesterday and then promptly deleted when I thought I had encountered a problem. After some debugging today it was actually just a problem in my code.

So far, with basic redis ops it looks to be performing well under the new event loop.

[nrk]

Thanks @Andrewpk, I too did some tests and everything seems to be working fine.

I'll probably merge these changes into the master branch during the weekend right after tagging the current HEAD so that people can easily stick with a version that depends on react v0.2 if they don't want to bump their dependencies.