Adding user filters
 V2 Ruby documents
 Changed navigation in tutorial Part 6 to include tutorial Part 7, Mandatory User Filters
Added a first stab at user filters reference
 Corrected Additional Navigation Issues

 Adding user filters

 V2 Ruby documents

 Changed navigation in tutorial Part 6 to include tutorial Part 7, Mandatory User Filters
 Changed part 7 to link back to 6
 Changes to User Filters Guide
 Added in the options for selecting Attributes (URI, Label, Object Id)
 Changing the example to work with one user
 More corrections to User Filters Tutorial
 Small edits user Filters tutorial
 Proposed final User Filters