RFR: 315: Publish command is not in GitSkara.java

[Erik Helin]

Hi all,

please review this small patch that adds the `publish` command to
`GitSkara.java` so that `git skara publish` works.

Thanks,
Erik

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Commit messages:
 - skara-315

Changes: https://git.openjdk.java.net/skara/pull/515/files
 Webrev: https://webrevs.openjdk.java.net/skara/515/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-315
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/515.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/515/head:pull/515

PR: https://git.openjdk.java.net/skara/pull/515