Define Thumbnail Candidates

Starting with version 0.5, pageflow supports supplying custom
thumbnails for new page types.
Update README.md

little but important detail: before_after.js has to be added in app/assets/javascripts/pageflow/application.js not app/assets/javascripts/application.js
Merge pull request #2 from kerygmafabian/patch-1

Update README.md
Update README.md

Fix path of application.css.scss file.
Update README.md

Another little typo: application.scss.css must be application.css.scss
Merge pull request #3 from kerygmafabian/patch-2

Update README.md
Update README.md

Add link to troubleshooting wiki page.
Merge pull request #1 from tf/thumbnail-candidates

Define Thumbnail Candidates
bump to version 0.1.0