feature: Added helpers with definitions for default branches and remotes.

bf731aa - Added helpers with definitions for default branches and remotes. <David Souther>
266a874 - Bash-only. <David Souther>
fe7471f - Added update command to git-hub-feature. <David Souther>
f55c6bb - Renamed to upercase. <David Souther>
271d111 - Added publish command. <David Souther>
5fdbd7d - Feature script with help, starting new feature. <David Souther>