Ignore meta-intel.
Convert oe-core from a submodule to simply being checked out using the LAYERS / fetch.sh stuff.

Submodules are very brittle and if we want the submodule to be at
a different point in the branch history in different branches then
we're out of luck.
Move downloads to a more standard location.
oe-core master requires bitbake > 1.19 so there goes the bitbake submodle ...
Set bitbake and oe-core branches to track master in LAYERS file.
Add bitbake directory to .gitignore now that it's no longer a submodule.
Merge branch 'master' into ndvm

Bring NDVM build branch up to date. Now that meta-virtualization
has support for Xen guests we don't need all of our old stuff.

Conflicts:
	.gitmodules
	LAYERS
Add meta-integral to LAYERS and update .gitignore.
Switch to using meta-integral for NDVM config and images.