Increase utils code coverage
Fix bugs. Improve test coverage.
Fix test_datasets
Improve docstring
Add a test for low_pass and high_pass values

Test if high pass is lower than low_pass. In this case, the signal would
be completely lost. This should not happen.
Fix headers
Fix bug related to haxby dataset bunch names
Fix Searchlight example
Add a SearchLight basic test
Fix header in test_searchlight
Fix docstrings
Searchlight test runs with one pixel activation
Draft of nifti_masker documentation
Fix plot_visualization
Raise an error if shape is specified and not affine in resampling
Nearly final tutorial on nifti masker
Mock urllib2 to test dataset fetching
Fix unneeded parenthesis
Add test resample with shape and no affine
Add a simple example for Nifti Masker