Fuse bootstrap.sh and Dockerfile...

...and added environment variables that show RocksDB the way to our vendored versions of snappy and gflags.
 rebase in progress; onto 08afd18
move dnsmasq to our repo; reorganize
update CircleCI to new base Docker image
address @spencerkimball's feedback
`make acceptance` for CircleCI & better local cluster
have CircleCI cache dnsmasq for `make acceptance`
CircleCI: Hack to manually set timestamps and get Docker to cache
Merge pull request #159 from tschottdorf/dockerfix

Shared build process for bootstrap.sh and Docker...