Adding option for enabling/disabling rainbow tooltips (Issue #79)
Organize using statements
Adding more checks to avoid exceptions in CurrentColumn highlight (Issues #80 and #81)
Updating version numbers for v2.1 release
Rename some rainbow tooltip related files
Remap SnapshotPoint to the view in the rainbow tip highlight to avoid exception on VS14
Some improvements for VS2014 compatibility in rainbow tooltips
Update appveyor file