Introduced CelluloidTest as a test class for all tests that depend on
Celluloid being up and running.

We handle these errors nicely in the dispatcher and have tests for that.
Tests should fail or err out when running into exceptions we are not
handling yet. But for these it's better to just skip.

This is a first step. In case the suspected nicknym server cannot be
reached we will now move on and try other sources.

It's robably not what we want in the long run. In order to know wether
no key exists or we just failed to connect to some servers a different
http response code would be nice if network errors occured.

This simplifies testing such scenarios in the unit test and makes the
remote tests skip on network failure.

Includes our first functional test. This one only makes sure loading
the bin/nickserver actually works fine. Enough to catch this bug.

Dropped the webmock dependency. We have our own http adapter. So we can
stub that to inject a mock. As an added bonus this does not mess with
other http requests.

Also wrote down testing strategy. Not completely implemented yet.