Fix typo "circunference"
build: Raises required version of GLib to 2.32

We are using new GLib thread API introduced in 2.32, like g_mutex_init().
Replace list appends with prepends for efficiency
Fix inefficient list traversal
Add priority queue
New implementation of Dijkstra
Pqueue: Get rid of GHashTable for more performance
Merge two initialization loops in dijkstra_to
Pqueue: cosmetic fixes
Pqueue: remove useless condition
docs: Add missing : in the end of the symbols' names
docs: Fix wrong symbol name for the focus point getter

It had been copied from the focus point setter and not changed.
Check if the skeleton is a SkeltrackSkeleton in the focus point getter/setter
build: Don't install PQueue header
tests: Drop deprecated g_type_init call
examples: Port Kinect example to Clutter 1.12
tests: Fix failing test
Update copyright info and author's email

In skeltrack-skeleton.c and AUTHORS.
Release 0.1.12
Fix small bug in skeltrack_skeleton_set_property