Just saving WIP before moving to installer wrapper scheme.

AFAIK this should work to build and upload installers from a
'latest' tag that includes master HEAD as of this writing.  Alas,
I can't make such release.  Anyway, installer wrappers seem close
enough that it may make sense to just skip building installers in
the cloudmaster altogether (which would also require some changes
to be synced with lantern-controller).  I'm saving this just in
case I need to come back to this scheme or use anything from here.
Remove stuff that only made sense for building installers.
Build fallback installers.