RFR: Initial version of issue updater

[Robin Westberg]

Hi all,

Please review this change that adds the first version of an issue updater (similar to what hgupdater currently provides for mercurial repositories).

Best regards,
Robin

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Commits:
 - ebed0696: Initial version of issue updater

Changes: https://git.openjdk.java.net/skara/pull/273/files
 Webrev: https://webrevs.openjdk.java.net/skara/273/webrev.00
  Stats: 241 lines in 5 files changed: 192 ins; 45 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/273.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/273/head:pull/273

PR: https://git.openjdk.java.net/skara/pull/273