Rasplex openelec

This pull incorporates two minor fixes.  

The change in the startup file for that the check is not looking for the debug directory as a directory and not a file. 
Trello card: https://trello.com/card/debug-directories-issue/510c4d34e1d17df66c00092a/185

The other is to remove the 'ssh' kernel boot argument from the cmdline.txt file in create_sdcard.  This will then allow a user to turn ssh on and off from the rasplex settings menu.
See issue card: https://github.com/dalehamel/rasplex-settings/issues/2