Write output to stdout if no "CLIENT_FILE" is specified + clean-up
Add the ability to reset the layout (screen-size)

* Add "reset_layout" method to "LayoutHelper"
* Add tests for all "LayoutHelper" methods
* Update "BaseBridge" command parsing logic to call directly into its
  "LayoutHelper" instance if the right prefix ('~') is specified
* Remove executable bit from ".screenrc-hijack"