Feature/mie 1337 require.js build changes to remove hardcoded id

Separates the require.js's configuration (now lives in config.coffee) from the initialization (main.coffee) of the module in order to remove the user's hardcoded id from the build file. We also added 'ActivityStream' as a separated module.

The example instanciation of this module was moved to app/index.html

This is where we remove the hardcoded id, that until now, was being added to the main.js build file.
The require statement at line 17, is needed since, this script is being used by r.js to generate the build file. The main.js (build file), would be almost empty if that line wouldn't be there.