Move the repo fetching logic into functions.
Add checking for necessary files.
Move cloned repos to an 'src' directory.
Simplify the logic to loop over LAYERS.
Add 'src' to path in the environment and bblayers.
Change LAYERS format so we can separate bitbake from the meta layers.
Put new metas directory in the ignores.
Merge branch 'master' into ndvm

Conflicts:
	.gitignore
	LAYERS
	conf/bblayers.conf
Remove submodule file as it hasn't been used for a while.
Remove extra bitbake line.
Add INTEGRAL_EXPORT_DIR to local.conf

The best way to customize this is to make ${TOPDIR}/integral-images
a symlink to someplace accessible to other build trees. This will
allow your other builds to grab these files and make packages out
of them.