Prefer the MIT Licence in README and LICENSE and .gemspec
Fix licensing
Merge pull request #703 from capistrano/fix/cc-license

Change the LICENSE.txt to CC by nc sa.
has ~> hash
Merge pull request #721 from parkr/patch-2

has ~> hash
Update SSHKit url
Merge pull request #728 from bry4n/patch-1

Update SSHKit url