add data-start-indexv #427
merge notes float fix and support for multiple fragments with same index
fix previousFragment, was hiding in reverse order #435
upgrade to 2.5.0
-ms-touch-action for #450
float fix in notes-server plugin
viewport meta to fit notes window on ipad
Added initial code from non-plugin version.
Rewrote as a Reveal plugin.
Merge branch 'position-images' into dev
Merge remote-tracking branch 'upstream/dev' into dev

Conflicts:
	js/reveal.js

Replaced my changes with upstream version.
Added some debugging code.
- Cleaned up the initialisation of the script.
- Ensured that the existence of the script is detectable.
- Added tests to ensure plugin loads after position-images (if loaded) and only
  when the document is ready.
- Removed debugging code.
- Removed debug and other obsolete code.
- Tidied up comments.
- Closes #4.
- Removed debugging code.
- Tidied comments.