Sshx

New Features

* add scp via multiple jump hosts
* add connect via multiple jump hosts
* add jump host for scp
* add scp command
* forward without a shell
* add sshx forward command

Fixes

* fix tests.test_connect

New Features

* add via argument for connect

New Features

* add jump host in command line
* add jump connection for pexpect

Fixes

* fix jump connection error

New Features

* Add test for add command's abbreviation
* Add abbrev syntax for add command
* Add auto-adjust window size