Removed some bbappends that may or may not be required for danny.
I also modified our image recipes as danny packages have less requirements.
Updated recipe list
Transitioning to meta-gumstix from meta-gumstix-bsp
bblayers.conf contains meta-gumstix requirements now
Added source cache
Added sstate cache
Added source mirror and corrected sstate mirror
Merge branch 'danny' of https://github.com/gumstix/meta-gumstix-extras into danny

Conflicts:
	conf/local.conf.sample
Disabled the SState Cache because it may not be reliable
Correct errors in README.
Correct minor typos in local configuration.  This file should,
in general, match the local.conf.sample from meta-gumstix.
Remove coreutils.bbappend.  This is fixed upstream.