Fixed some nullPointer exceptions
Fixed SendStatusUpdate

Fixes #182
Added raw data length output to NodeString
Added image processor helper methods
Removed modification of buffer sizes
Automatically pre-process profile picture & thumb

Fixes #183
Made thumbnailBytes in SendSetPhoto optional
Changed ClearDirty to protected
Added support for group creation callback

Fixes #161
Added node to all message delegates

Fixes #29
Added participant notification events
Added timestamp to DateTime conversion methods
Added participant notification handler
Added subject notification handler
Configure SyncMode and Synccontext as enum
Changed accessors
Name in SendAvailableForChat is optional