DOC: added information to the readme file
DOC: more info in README
DOC: fixed .nii.gz extension
RF: update of unit test for fmri dataset
NF: stack samples
NF: split half correlation measure
NF: cosmo_map2array
ENH: allow empty sample attributes
ENH: use map2array for general view of slices irrespective of data type
ENH: more stuff in .gitignore
NF+RF: general dataset stack in either sample or feature dimension
ENH+DOC: improved split half correlations
RF: make fmri_dataset more general by allowing different reader functions for different file formats
RF+NF: fMRI datasets are loaded and written using more general code, allowing multiple file formats. experimental support for BV VMP
RF: remove map2nifti
RF: updated several files to reflect name change of map2nifti to map2fmri
RF: modularized fmri_dataset
NF: reading a dataset can also set attributes
NF: support for reading BV .glm
RF: cleanup for map2fmri