Fix faunus degree counting and add a dendrite-admin script that helps starting dendrite

This PR fixes faunus degree counting, which had three problems:

* First, we weren't connecting to our elasticsearch cluster
* Second, Faunus wasn't bundling in the elasticsearch jar files (that was fixed in https://github.com/Lab41/faunus/commit/d21a2a410537344cca286161286d1a4e4f2d91df).
* Third, we weren't filtering out edges.

It also includes a small `dendrite-admin` script that simplifies launching a daemonized version of dendrite.