FIX: Finish package rename from mst -> sparsetools. Fixes #2189.
DOC: Fix backwards docs on thresholds for preprocessing.
Merge pull request #2196 from erg/labelencoder-docs-fix

DOC: Fix backwards docs on thresholds for preprocessing.
make new classes for lasso_path/enet_path and deprecate old
ENH : massive refactoring of CV models in coordinate descent. Now the algo core is in path functions
update what's new
FIX: Py3 print statements to print functions
Merge pull request #2195 from erg/bug-2189

FIX: Finish package rename from mst -> sparsetools. Fixes #2189.
DOC : fixes in covariance module
DOC : more fixes in covariance module