ENH: allow loading from a list of 4D (and 3D) nifti volumes

so we could easily load in 1 construct 4D files from different sessions
ENH: mvpa2-analysis: load multiple input volumes (glob + sorting) and attr files with more than 2 columns and a header
Merge branch 'master' into _tent/mnn

* master:
  ENH: mvpa2-analysis: load multiple input volumes (glob + sorting) and attr files with more than 2 columns and a header
  ENH: allow loading from a list of 4D (and 3D) nifti volumes
  tiny tipo
Merge branch 'master' of https://github.com/PyMVPA/PyMVPA
NNO adding searchlight stuff
NNO adding searchlight stuff
NNO adding searchlight stuff
updating voxel selection
DOC: download instructions -- point to windows installers and neurodebian vm
ENH: make @with_tempfile cleanup directories and possibly multiple files as well
ENH: h5save got argument mkdir (default to True) to create all needed leading directories
ignore another generated file as well
searchlight in pyMVPA working!
searchlight in pyMVPA working now with example
searchlight in pyMVPA working now with example; cleanup
preparing for push to hydra
added surface based searchlight example
ready for test push
minor documentation things
ENH: allow to set a datameasure for Searchlight instances thus allowing None in the constructor