Release 3rd party tarball with bloom 0.3.5

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I am creating release repositories for ceres-solver and it's dependencies glog and gflags.

For glog I want to use the tarball as it has version information, the bare SVN repository does not seem to have tags.

I configured the release repository like this.

Running git-bloom-release groovy gives me the following error:

$ git-bloom-release groovy
Processing release track settings for 'groovy'
What version are you releasing (version should normally be MAJOR.MINOR.PATCH)? 0.3.3

Executing release track 'groovy'
==> bloom-export-upstream https://google-glog.googlecode.com/files/glog-0.3.3.tar.gz tar --tag 0.3.3 --display-uri https://google-glog.googlecode.com/files/glog-0.3.3.tar.gz --name upstream --output-dir /tmp/tmpZgzPa2
usage: bloom-export-upstream [-h] [--tag TAG] [--output-dir OUTPUT_DIR]
                             [--display-uri DISPLAY_URI] [--name NAME] [-d]
                             [--version] [--unsafe]
                             uri {git,hg,svn}
bloom-export-upstream: error: argument type: invalid choice: 'tar' (choose from 'git', 'hg', 'svn')
<== Error running command 'bloom-export-upstream https://google-glog.googlecode.com/files/glog-0.3.3.tar.gz tar --tag 0.3.3 --display-uri https://google-glog.googlecode.com/files/glog-0.3.3.tar.gz --name upstream --output-dir /tmp/tmpZgzPa2'

Is the tarball option not fully supported by bloom yet?