Dependencies: Updated Files library
Creep: Added address and identifier retrieval
Creep: Added file selection on model loading
Creep: Added methods for retrieving entity node's identifier and address
Creep: Added method for retrieving whether given node has a member
Creep: Added collection methods to count and filter elements
Fix: Added some missing constructors

I'm pretty sure there are quite a few other missing things I'll be adding, but I'd better not think too much about it, or I'll get overwhelmed. >.<