MV: add get_neuromag_trans to the coreg module

get_neuromag_trans is used to transform points from their space to the
neuromag RAS space.
RENAME

rename get_neuromag_trans to get_ras_to_neuromag_trans.

fix breaking the test_coreg.py
FIX

Global replacement
Merge pull request #852 from t3on/tb-coreg

MV: add get_neuromag_trans to the coreg module
FIX: NameError in mne/coreg linalg.norm
ENH: spm face data set
ENH: spm face data set ++
FIX : stuff here in there in dowload of datasets
ENH : add spm demo script
add denis
ENH: better unpacking
COSMSITS
FIX: folder_name mismatch
FIX/ENH: misc + add ICA
update script
CLEANUP
ENH: pip install sklearn
ENH: pip install sklearn 2