STY: redundant args in stc.transform() and stc.transform_data()
ENH:  add prepare_bem_model wrapper
ENH prepare_bem_model:  add sol option (output filename)
FIX: setup_volume_source_space arg
ADD: init file for tests
ENH scale_mri:  allow scaling source spaces separately
RM: content is unnecessary, empty file is sufficient
Merge pull request #891 from christianmbrodbeck/coreg

ENH scale_mri:  allow scaling source spaces separately
FIX: Added decoding and realtime modules
Merge pull request #892 from mainakjas/fix_autocomplete

FIX: Added decoding and realtime modules
Merge pull request #889 from t3on/tb-init_ADD

ADD: init file for tests
Merge pull request #888 from christianmbrodbeck/fix-vol-src

FIX: setup_volume_source_space arg
STY/DOC prepare_bem_model:  sol_fname parameter
Merge pull request #884 from christianmbrodbeck/prepare_bem_model

ENH:  add prepare_bem_model wrapper
FIX: Fix mri handling
FIX: Typo
Merge pull request #893 from Eric89GXL/vol-mri-fix

FIX: Fix mri handling
FIX: Fix error wording.
FIX: Fix docstring wording.
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