Add star-translate and dev-bundle packages

dev-bundle exposes the shell script that downloads the dev bundle. We need this
in a package because both star-translate and tools/bundler.js need access to it.
Change satellite translator to star translator in translated manifest
Remove shell script plugin from star-translate

(It exists in dev-bundle now)
Add comment to shell script plugin
Rename dev-bundle to dev-bundle-fetcher
Merge branch 'translator' into linker