Misc changes to soloistrc

- Only run the known_hosts_github recipe from sprout ssh as we don't want the git-projects hacks installed
- Clears out and sets up the dock
- Replaces cask of shiftit with recipe that install onsi's shiftit plus bypasses accessibility warnings
- Replaces ack with ag
- Removes libreoffice as it is so rarely used now and google apps takes care of most of it
- Replaces dropbox with google drive app
- Removes menumeters cask install to be replaced by sprout-osx-apps::menumeters (currently broken)
- Adds google hangouts app
- Adds xscope
bumps cookbook shas
Updates gem lock with addition of foodcritic gem