fix(devserver): Gut code related to ChromeOS image/data downloads

We don't use any of this functionality, it even hard-codes ChromeOS gs
buckets so we aren't likely to start using it. Removing this and related
unit tests allow the remaining tests to pass.
fix(gmerge): Remove remount and /usr/local code, add new config paths.
Merge pull request #10 from marineam/release-files

Cleanup and new release files