second-order : tune parameters
Merge branch 'master' of https://github.com/meduz/SparseEdges

* 'master' of https://github.com/meduz/SparseEdges:
  secondrorder : more params
  secondrorder : more noise
  second-order : scale parameters

Conflicts:
	default_param.py
	experiment_fig-secondorder_segmentation.py
	secondorder_prior.ipynb