Moved Imports class to the dataImports module
Implemented importing of contacts' events by group.  This method is now run with the loading of a group in the ContactsList Activity
Implemented a checkbox setting to control the updating of contacts in the ContactsList Activity.  Off by default.
Added icons to represent groups in the group maker.
Started to create the contact stats editor. unfinished
Identified bug with the renderscript that can only be fixed by using support libary v8