WIP: first pass through BDF converter
ENH: read edf+ reader

Includes reader for EDF+. Renames to edf to include both bdf and edf+.
FIX: 2.6 compatibility COSMITS

cosmetics, remove unnecessary function.
Remove dictionary comprehension.
FIX: stim channel problem with BDF
ADD: stim_channel kwarg
ENH: API

Added n_eeg argument to handle channel info.
Added error messages
COSMITS: merged params dict with info dict
UPDATE

Combine the info dict construction into one method.