DOC A less-nested coverage of model evaluation
Fix heisenbug due to addition of max_iter param in LSVC
Merge pull request #3528 from MechCoder/fix_heisen

FIX heisenbug due to addition of max_iter param in LSVC
Merge pull request #3527 from jnothman/unnest-model-evaluation

[MRG] DOC A less-nested coverage of model evaluation
FIX Exact inverse transform for whitened PCA
TST test whitened inverse
ENH components of unit length and whitening done by scaling with sqrt of explained variance
DOC What's new