[nemo-qml-plugin-contacts] Fix out of bounds error when removing item. Fixes JB#7180
Merge pull request #12 from SamuelNevala/fixremove

[nemo-qml-plugin-contacts] Fix out of bounds error when removing item. F...
[nemo-qml-plugin-contacts] Export constituent contacts JB#7014

Needed to permit clients to represent the constituent contacts which
comprise an aggregate contact.
[nemo-qml-plugin-contacts] Do not refresh lists unnecesarily