Optimize performance by not binding services after app deployment (causing an additional app stage)

Change-Id: I1006cc4ce17c27a9bc45294037acea2cd7d2454f
Remove the category support as buildpacks will only support switching version by modifying app

- For example, changing "ruby 1.8.7" in Gemfile or node: "0.6.x" in package.json

Change-Id: Ied445bd2adaea65fba1c8644ca58151a7123fa1d
Remove tests for autoreconfig disable, as it's opt-in in buildpack world.  Bump assets to include all buildpack changes

Change-Id: I85dbd63c5bbefaebac32241c9b75586bc22acfa3
Remove Erlang, PHP, Python tests for unsupported dev_setup

Change-Id: Iecc569a863ebdd272ea017ea446902b63981015d
Update yeti for buildpack changes

- Change asset framework to "buildpack"

- Remove tests for BUNDLE_WITHOUT (not currently honored by build pack)

- Allow postgres driver to be copied to Play app (now copies both mysql and postgres)

Change-Id: Icae9919d15fa4328fbd3790505f6721fb6530c50