FIX : improve support for CTF system
FIX + ENH : add docstrings + fix bugs in CTF compensation
FIX : fix in make_compensator
STY: simplify make_compensator
ENH : get rid of useless findall function
FIX : was broken by last commit ...
typo
API : deprecate CTF compensation in Epochs and move it to Raw
update what's new
TST : add some tests for compensation
ENH : move CTF raw to _read_raw_file
MISC : cleanup suggested by eric
FIX : revert compensation when writing
FIX : add comp to RawKIT
Merge pull request #612 from agramfort/ctf_fixes

MRG : improve support for CTF system