MAINT: Remove BaseLibLinear for LogisticRegression
ENH: Improved verbosity and denesting
MAINT: be robust to numpy's DeprecationWarning

numpy 1.9 raises a lot of 'VisibleDeprecationWarning', which breaks our
test suite
FIX: Fix the imputation example
Repeated word: 'the the' -> 'the'

Removed one "the".
Merge pull request #3598 from GaelVaroquaux/np_warnings

[MRG+1] MAINT: be robust to numpy's DeprecationWarning
Merge pull request #3604 from rahiel/patch-1

Repeated word: 'the the' ~> 'the'
Merge pull request #3603 from MechCoder/fix_imputation_example

[MRG] FIX: Fix the imputation example
DOC rename "imputation.py" to "missing_values.py"

Should make it easier to find.
MAINT: Made the following changes
1. Use a single loop for both ovr and multinomial conditions
2. Better warning messages for penalty and loss conditions
3. Convergence warnings print only if verbose > 0
4. Used check_X_y instead of check_X
DOC dtype parameter on validation functions

Fixes #3609.
Merge pull request #3591 from MechCoder/refactor_logreg

[MRG] MAINT: Remove BaseLibLinear for LogisticRegression