Since some conversion tools do commits with an empty commiters email
address gitlab will fail with a 500 error

This gives us Github Flavored Markdown, which is awesome.

The gravatar documentation on implementing the hash specifies that leading
and trailing whitespace must be trimmed and all characters should be forced
to lowercase.
Signed-off-by: NPat Thoyts <patthoyts@users.sourceforge.net>

  * Remove trailing whitespace
  * Converts hard-tabs into two-space soft-tabs
  * Remove consecutive blank lines