ENH: MultiTaskElasticNet (and Lasso) CV
Added enet_multitask_path
FIX: Formula for multi-task alpha and removed for loop
Removed an if block for mono-output methods
FIX: First attempt at fixing tests in test_common.py
FIX: Test case for sparse matrices
DOC: Added doc for multi-enet path and other minor changes
TST: Added tests
TST: Minor changes
FIX : cleanup + comments in MultiENetCV
FIX: XXX in Docs
FIX: Alpha grid for each l1_ratio
PEP8 and other minor changes