Expose policyCompassConfig as global variable

We need the config in order to allow disabling entire modules in app.js.

If there's a way to do that with dependency injection instead of global
variables, this should be changed.
Load AdhocracySDK as angular service

This is disabled in config.js, as it requires a running Adhocracy
installation.
Add auth service, using the Adhocracy service
Add Auth.userIndicator directive

The new directive is exemplarily put in the header.
Add deliberation module with showDiscussion directive

The showDiscussion directive currently needs a hardcoded Adhocracy URL,
so this is basically useless in the PolicyCompass setting yet.

It could be integrated by adding a snippet like the following (with an
existing URL of an Adhocracy commentable):

<show-discussion data-
path="http://localhost:6541/adhocracy/dede/VERSION_0000001"></show-
discussion>

At a later point, this directive will take care about creating a related
resource on Adhocracy site automatically.
Use adhocracy url from config

Note that this doesn't solve #9.
Load hardcoded adhocracy script in index.html (workaround for #9)

This results in an error message for everybody without running adhocracy
frontend, but therefore #9 remains open.
Merge pull request #7 from nidico/create-adhocracy-modules

Create adhocracy modules