Add new screenshots
Properly migrate XML -> Markup
Add options page screenshot
Update CHANGELOG and README for updates
A little extra documentation
Bump version number
Merge branch 'release/0.3.0' into develop

* release/0.3.0:
  Bump version number
  A little extra documentation
  Update CHANGELOG and README for updates
  Add options page screenshot
  Properly migrate XML -> Markup
  Add new screenshots