contacts-utils: Add activate_action function

Add a function that activates an action on a given appid.

https://bugzilla.gnome.org/show_bug.cgi?id=658553
Add a map pin icon

https://bugzilla.gnome.org/show_bug.cgi?id=658553
contacts-app: Add our search path to icon theme

https://bugzilla.gnome.org/show_bug.cgi?id=658553
contacts-contact: Add method to geocode a contact

https://bugzilla.gnome.org/show_bug.cgi?id=658553
Add map widget
Add a map to the contacts sheet
Merge branch 'fixup' into wip/map-widget
	src/contacts-app.vala