Hlint changes to Docx writer.
Docx writer: Implement track changes.

These have default authors and dates of "unknown" and timestamp-zero,
respectively.
Docx writer: Default to user login and time of change if not given.
Docx writer: Accomodate GHC 7.4 (no lookupEnv)
Fixed exampleLine parser to accept example lines which have indentation at the start of the line.
Merge pull request #1565 from Chobbes/master

Org exampleLine parser accepts indented example lines!
Merge pull request #1564 from jkr/trackChangesWriter

Docx writer: write track changes.
DokuWiki Writer: Qualified all imports
DokuWiki Writer: Hlint cleanup
DokuWiki Writer: Refactor to use Reader monad
Merge pull request #1567 from mpickering/dokuwidth

DokuWiki cleanup
Merge from upstream.