FIX spectral_embedding test erros, ADD spectral embedding to sphere examples
FIX: seed blobs dataset to have a stable spectral clustering under OSX 10.8
Merge pull request #1470 from kuantkid/fix_spectral_cluster_test

FIX spectral clustering test error in OSX and ADD spectral embedding to sphere examples
Add comment in test_spectral_clustering_sparse
changed n_folds > min_labels error to warning

Also made indentations for continuation lines pep8. See
http://www.python.org/dev/peps/pep-0008/#indentation

Conflicts:

	sklearn/cross_validation.py
removed tests for the old error.

Is it possible to test for warnings?
added test for warning. Added warning category

Conflicts:

	sklearn/cross_validation.py
removed a carriage return in warning message
added space between # and text
FIX GridSearchCV on lists that I broke in 8b3e4d06c05ac82130176161404f0434b74fe2c7
ENH added test, started on cross_val_score
ENH allow lists in check_arrays
ENH make cross_val_score work, some refactoring in GridSearchCV
ENH consistency: stuff is not an array if it doesn't have ``shape``.
TST GridSearchCV raises ValueError when precomputed kernels are not matrices.
ENH Simplify estimator type checking in GridSearchCV.
Merge pull request #1465 from AWinterman/issue-1017

MRG More Liberal StratifiedKFold Input Validation
first pass at implementing sparse random projections
DOC: better docstrings
DOC: more docstring improvements