first work on removing target from landmarks
make target refs in lms weak break cylindricalrefs
Transformable has to have copy now
from_vector attempts to .copy(), warn if not poss
compose attempts to .copy(), warn if deepcopy
OrthoPDM attempts copy of model, warn if deepcopy
remove eepcopy from fitting result
fix MockFittingResult
initial version of obj exporter
add tests for export_obj
remove AppendNDims/ExtractNDims, use Homogeneous
Merge pull request #394 from jabooth/memfixes

weakref to break cyclic references
Merge pull request #393 from jabooth/corresgroundwork

Groundwork for dense correspondence pipeline
Merge remote-tracking branch 'upstream/master' into rmlmtarget

Conflicts:
	menpo/landmark/base.py
fix tests for landmark targets
tidy up imports
view_landmarks() via LandmarkableViewable
more efficient contiguous checks throughout
add LandmarkableViewable to the API refererence
remove debug print statements