Fixed up README so that badges now display
[markdown-notes] Added a (failing) .feature
[markdown-notes] Refreshed slide_markdown specs
[markdown-notes] SlideMarkdown now makes ```note or ```notes a speaker note
```notes or ```note now produce speaker notes when creating slides with Markdown

Merge branch 'markdown-notes' into upcoming

* markdown-notes:
  [markdown-notes] SlideMarkdown now makes ```note or ```notes a speaker note
  [markdown-notes] Refreshed slide_markdown specs
  [markdown-notes] Added a (failing) .feature
[upcoming] Removed test files that were no longer used