Adds command to auto post results to reddit

Adds link to reddit post to results table, adds migration for redditUrl
to poll, moves "copy reddit markup" to separate template to be used by
the automatic poster.
Incorporated code review feedback.

Renamed reddit_results_text.html to redit_results.text.md, moved the
reddit results post to a template, reconciled other references.
fix concatenation error on week < 0
Remove with app.app_context() from auto poster
Merge pull request #53 from brandonsato/auto-post

Adds command to auto post results to reddit