ENH: Add event histogram example
FIX: Only baseline correct data
FIX: Fix test
STY: Cleaner
FIX: No need for ion
FIX: Dont baseline correct
FIX: Fix debugs
FIX: Fix test
FIX: Whats new
Merge pull request #1328 from Eric89GXL/event-hist

ENH: Add event histogram example