revised the description of networks and site in the cyder core documentation
added updates to the core documentation regarding site and entwork validation
Merge branch 'master' into get_related_test
first draft of get_related for site model
added tests for get_related_networks function
fixes to network model
removed shared parent requirement on networks, wrote tests for related networks and added get_related to the site model
added tests for finding sites related to a given site and fixed the tests for networks
working on a new test for the get_related function in the network model
need to do work on these tests
added get_related_vlans
completed get_related_site tests for Site model and added diagrams
fixed the get related vlan functions
added get_related_networks and site to the vlan model
improved tests to handle more cases
preparing to merge
merging get related feature