jessie: Install xbindkeys directly from mirror.

Fixes #597.
Merge pull request #608 from drinkcat/jessie-xbindkeys

jessie: Install xbindkeys directly from mirror.
This will fix failure of chrome-* target install when it will be installed before a window manager.
Merged installs on one line.
Merge pull request #637 from divx118/master

This will fix failure of chrome-* target install when it will be installed before a window manager.