happo for npm release notes

Make scrollbar prevention less aggressive by taking the overflow property into account.

• Add bind configuration option

• Avoid calling cleanOutElement on non-elements.

• Include all nodes in screenshots.
• Remove snapshotEntireScreen option.
• Remove need for examples to return reference to element.
• Replace hover caption with title attribute.

• Disable nested scrollbars before taking screenshots.

• Fix broken image uploads.

• Break apart diff image into separate views.
• Add new "Swipe" diff view.
• Lock chunky_png at 1.3.6.

• Set content-encoding to utf-8 for uploaded HTML
• Use React to render diffs page

This version includes a few nice improvements to the diff review page:

• A favicon was added
• diffs/new examples are now linkable
• better looking UI (checkered background, better font stack, proper header, counts, etc)

• Fix error for examples that render off-screen (to the left and/or top)