initial work on BoundingBox
fix test to use bounding box in obtain_shape
Merge remote-tracking branch 'upstream/master' into boundingbox
fix centre bug
add tests
add docs, min max are properties not methods
Merge remote-tracking branch 'upstream/master' into boundingbox
update atm_fitter test to use BoundingBox
add PointGraph and BoundingBox to xref_map
Merge remote-tracking branch 'upstream/master' into boundingbox

Conflicts:
	menpo/fitmultilevel/aam/builder.py
	menpo/fitmultilevel/functions.py
	menpo/fitmultilevel/test/aam_fitter_test.py
	menpo/fitmultilevel/test/atm_fitter_test.py
remove fitmultilevel, fix PointDirectedGraph
update docs to use PointDirectedGraph
Merge branch 'boundingbox' into cvpr2015

Conflicts:
	docs/xref_map.py
	menpo/shape/pointcloud.py