DOC: Explicit instructions for Python3
Merge pull request #3586 from MechCoder/python3_installation

[MRG] DOC Explicit instructions for Python3
Added test for orthogonal LDA transform.
Fixed LDA transform.
Improved precision of the LDA orthogonality test.
forgot to remove an import
misc
added test for transformed scatter matrix
DOC Updated what's new
DOC fix link embedding regexp
DOC extend documentation on sample generators

Also allow make_multilabel_classification to return underlying
distributions.
Merge pull request #3001 from jnothman/doc_sample_gens

[MRG] improve documentation on sample generators
Update gaussian_process.py

just being specific as target value instead of value
FIX bug with set_params on minkowski 'p'.

Fixes #2609.

There was a bug that set_params didn't effectively change the value
of minkowski 'p'. Because 'p' was put in self.metric_kwds in
_init_params and then it never changed there.
DOC deprecation of **kwargs in neighbors per 0.18
TST fix doctest for k-NN
Merge pull request #3588 from tejesh95/patch-1

Update gaussian_process.py
MAINT: Remove BaseLibLinear for LogisticRegression
DOC: Added np.sqrt since default is 'squared=False'
Merge pull request #3593 from MechCoder/row_norms_doc_fix

[MRG] DOC: Added np.sqrt since default is 'squared=False'