Update etc/command/xiki_command.rb

For some reason, it is possible to get an unhandled exception the first time you install xiki as xiki_process.rb is not quite ready to be spoken to :) 
lib/xiki/keys.rb: correct location of keybindings

The key bindings are located in @$xiki/lib/xiki/key_bindings.rb, not
@$xiki/key_bindings.rb.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Merge pull request #47 from artagnon/master

Fix location of keybindings
Merge pull request #46 from vajrapani666/master

Friendly error message if xiki_process.rb does not promptly respond after we start it