FIX: Cast floats to int before slicing in robust_covariance

Fixes #1608.
BUG fix failing doctests
add loss function for gradient boosting binomial deviance
correct docstring
remove the equaldistance code warning, replace with doc warnings
use unique from sklearn backports (return_inverse)
FIX issue #1457 KNeighbors should test that n_samples > 0
ENH: doc hyperlinks, fixed size thumbnails, gzip support, searchindex.js
Update travis config to remove -qq flag for scipy
Revert "trying travis cfg with system-site-packages"

This reverts commit 343f895bdb0e3cb2f5c5452bf705256521fed3ba.
ENH Add support indices in svm for sparse matrices
ENH import six package for Py2/Py3 compat in a single codebase
P3K: support for py3k in dict_vectorizer module
P3K use six.string_types and six.PY3
P3K one more iteritems
PY3: Fix stdout capture in graph lasso test
P3K More python 2 / 3 compat in tree exports
COSMIT rm Python 2.5 and Jython compat from six
BUG fix import problem in preprocessing

All tests pass on my box, except a CRC error in downloading the
LFW people dataset.
add warning for no internet