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

might want to change one of these to an array as well...