Merge pull request #2 from aaronkennedy/master

Miscellaneous improvements in exposed APIs
Merge pull request #3 from aaronkennedy/master

[nemo-qml-plugin-calendar] Add API for setting alarm reminders
Merge pull request #4 from aaronkennedy/master

[nemo-qml-plugin-calendar] Add alarmProgram property
[nemo-qml-plugin-calendar] Multiple notebook support

All but the default notebook are marked as readonly.  Each notebook
is assigned a user-specifyable colour and can be individually enabled
and disabled.