RFR: 274: Remove quoted part of top-level reply emails in GitHub comments

[Robin Westberg]

Hi all,

Please review this change that looks for quoted parts in bridged emails which can be safely discarded, as the context
is clearly visible anyway in the GitHub web UI.

Best regards,
Robin

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Commit messages:
 - Detect and filter quoted PR blocks

Changes: https://git.openjdk.java.net/skara/pull/625/files
 Webrev: https://webrevs.openjdk.java.net/skara/625/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-274
  Stats: 135 lines in 3 files changed: 134 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/625.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/625/head:pull/625

PR: https://git.openjdk.java.net/skara/pull/625