Merge pull request #29 from yarikoptic/master

Added data/ submodule with the dataset (from neurosynth-data)
Added full meta-analysis set example
Added full meta-analysis set example
Fixed submodule path
BF: adjusting url to new lower cased version
Added nan_to_num check in image masking
Formatted package with AutoPEP8
minor cleanup
template for new classifier module
updated init, fit, & fit_dataset in Classifier class
removed coactivation test temporarily
Merge branch 'master' into decoder-refactor

t message to explain why this merge is necessary,
Wrote classify_regions. To extract feature_data by id needed to add get_feature_data to dataset
Fixes #31
updated classify_regions: working, just need implement classify. updated get_feature_data.
minor improvements to data getter methods
Added stuff to Classifier
minor improvements to data getters
Classify class and classify function work now ... not yet fully complete but classify
Test cleanup