multipart call for adding / removeing contacts ; status and limit parameters added
new paths added for contact trackingg by email campaign and all contacts activities;
example change to accommodate parameter changes;
added new functions to take into account new modified_since parameter;
Added permalink_url to Email Campaign
Added new component classes  and functions for all activity tracking , and activity tracking by email campaign;
changed call of a contacts collection function that was altered with the update;
added created_since parameters to contact tracking endpoints;
updated comments on function descriptions, added missing result parameters;
added created_since parameters to email campaign tracking endpoints updated descriptions;
updated example prom file to take in the new component files;
updated example to take into consideration a collection new parameter;
removed unsupported parameter;
Minor code cleanup
New documentation
Limit from NSString to int
NSMutableDictionary to NSDictionary
New README
"NSString* limit" to "int limit" for @param
Regenerated documentation
"NSString* limit" to "int limit" for @param