move react back to a normal dependency
Remove duplicate dependency
[fixed] Avoid some warnings
[added] Browser build script

There is currently no way to NOT use Browserify's "process" shim
since the code we're requiring in react/lib uses the process object,
so the build is slightly larger than it needs to be. If React core
would expose the stuff in react/lib as modules, we could avoid it.

Fixes #73
[added] Browser builds for version 0.2.1
Move envify transform declaration to package.json