FIX: perecentage non-ignored
Merge pull request #1134 from dengemann/drop_log_perc

FIX: perecentage non-ignored
Enhance API:mne.get_config to return config dict when called wthout params
Fix docstring, make more explicit
Fix return config if key is None
Fix check for non null keys in os.environ
Merge pull request #1135 from saketkc/issue#1112

Enhance API:mne.get_config to return config dict when called wthout para...