ENH: info class
FIX: add files
FIX: indent
ENH: unobstructively implant info class
ENH: refactor + move tests
polish + finalize Info implant
FIX: keep using copy.deepcopy for now
FIX: unintended BTI change
COSMITS
Merge pull request #660 from christianmbrodbeck/fix-subdir

FIX TESTs:  add subjects_dir parameters
ENH: improve string summaries
ENH: add repr to tutorial
Merge pull request #659 from dengemann/info_class

ENH: info class
Update raw.py

... leftover.
ENH: i/o for fiducials fiff files
ENH coreg:  add MriHeadFitter
ENH: add GUIs:  MriHeadCoreg,  FixDigHeadShape,  FindDigPoint
ENH: import shortcuts / mne.gui module
DOC
ENH: mri fitting with scaling

 - Make `MriHeadFitter` a subclass of `HeadMriFitter`
 - update giu