Add notice that XRank uses Postgres 9.2
Add a Resource model
Add factories for different type of resources
Add spec for model Resource
Adjust the URL generated in Resource model's factories
Fix error: tests for image resources was using resource_webpage factory
Use :url instead of :source for image & video resources
Add a validator for Resource model
Fix bug: tests for Resource of type  was having data[:source] instead of data[:url]
Extract ResourceTypes out
Resource model to make use of ResourceValidator class
Resource factory to produce an empty Hash for Resource.data by default
Refactor ResourceValidator for better structure
Move the presence check for type & data back to Resource model
Add test for when Resource have no / empty data
Add validation check for data & type in Resource model
Use forked version of neoid, which supports json field
Store Resource on Neo4j
Use forked version of neoid, which supports json field
Merge branch 'model/resource' into development