Added metadata/layout.conf file

Done following this portage warning:

!!! Repository 'touchegg-overlay' is missing masters attribute in '/var/lib/layman/touchegg-overlay/metadata/layout.conf'
!!! Set 'masters = gentoo' in this file for future compatibility
Updated qt dependecies naming
Fixed qt packages naming; had got it wrong.. :-(
Updated mtdev dependency name
Merge pull request #1 from bartoz/master

Updated dependency names