make bacon and custom releasetool (for squished zips)

Change-Id: I4f61b6a6b9b8bab8582fa5423c4134c07af17606
add support for custom releasetools

Conflicts:

	core/Makefile

Change-Id: Ia8b7d956b1a1be0ec4d69dffcb3ac04edb29e567
Revert "Load only the current product config makefile."

This reverts commit 54fa8c3ff9b1f0f1b0b9c551be864f1b7378c7fc.

Conflicts:

	core/product_config.mk