Test to observe query patterns in postgres for graph algorithms
Added ActiveModel serializers
Remove graph DB classes
Added specs around the relationships, specifically service relationships
Added reflexitive relationship specs
More fields exposed via JSON
Expose descriptions to JSON
Use strong_params properly
Merge branch 'adjacency-list-postgres'

This enables graph like relationships between any models which inherit
from the base Node. As there isn't much need for traversal, the inefficiencies of
this are not large enough to warrant switching to a graph database yet.
Deciding on a controller test strategy