* The use of |repo manifest| to determine when B2G patches should be reapplied
  is now disabled by default due to performance concerns winning over
  correctness (especially when working with a workspace over NFS!)
  To enable the more correct behavior define BSG_USE_REPO in your environment.
* |. build/envsetup clean| will now revert all B2G patches.  Much less
  typing than |repo abandon b2g_autogen_ephemeral_branch|
* Improved error reporting to stdout when a patch fails to apply
* On failure, the |lunch| and |choosecombo| commands are stubbed out to prevent
  further damage.  This is necessary as it's not possible for a 'vendorsetup.sh'
  to report an error back to build/envsetup.sh
* Before applying patches to a project, the project is now restored to HEAD to
  ensure a pristine base environment.

Change-Id: I2b32ee8b10e342b754707249a09342462d6bcfc4

Fix GECKO_OBJDIR and provide symlink for load-config.sh

Change-Id: Ifaf70ecd7518a4dd3d76fea68583fe589b35ba7f

Change-Id: Icc6c66d598a77ad54023090ae059d3181c746107

Change-Id: I081cfe3ee27af8d98b07e489d460bb826559e92a

Change-Id: I7af42f1d4c895ee7eddcd7f1ae50162471537fb2

Change-Id: I354bace1c217fa1e2b8e4dbef9d8b129871da898

Change-Id: I2af4bb23f8d964c4bac4983131f5b4c56e9a536c