RFR: 177: Filter markdown escapes when sending plaintext emails

[Robin Westberg]

Hi all,

Please review this change that extends the markdown to text filtering to handle the escapes that can be inserted by the text to markdown filter.

Best regards,
Robin

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Commits:
 - 1154c19b: Remove the formatting that TextToMarkdown can insert

Changes: https://git.openjdk.java.net/skara/pull/288/files
 Webrev: https://webrevs.openjdk.java.net/skara/288/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-177
  Stats: 24 lines in 2 files changed: 22 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/288.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/288/head:pull/288

PR: https://git.openjdk.java.net/skara/pull/288