Improve the docker version and docker info commands
Update api docs
Remove cgo from term
Use uintptr instead of int for Fd
Remove unused constants
Move Termios struct to os specific file
Merge pull request #772 from dotcloud/improve_version_info_cmds

* API: Improve version info cmds
Update test to reflect new ApiInfo struct
Merge pull request #784 from dotcloud/remove_cgo_dependency

* Runtime: Remove cgo dependency
remove check on login
Merge pull request #793 from dotcloud/774-remove_login_check_on_pull-fix

- Registry: remove login check on pull