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 remote-tracking branch 'upstream/master' into enh/diffusion

* upstream/master:
  Repeated word: 'the the' -> 'the'
  MAINT: be robust to numpy's DeprecationWarning
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.
Merge remote-tracking branch 'upstream/master' into enh/diffusion

* upstream/master:
  DOC rename "imputation.py" to "missing_values.py"
  FIX: Fix the imputation example
fix: remove method options