fixed an issue with the help history command, printed twice
fixed issue with rmi help showing help twice
Cleaned up error checking of 'docker pull', to be symmetrical to 'docker push'
Improved error checking of 'docker pull' by printing body of HTTP error
Merge branch 'origin/18-termcap_issues-fix'
Merge pull request #164 from kencochrane/users

Fixed help commands that were printing double.
Fixed issue with misplaced cursor after output