Add `[is[image]]` filter operator
Add support for serving TW5 with lazily loaded images
Docs update
Refactor the image parser to avoid generating badly formed image src's

Previously, a transclusion of a skinny image tiddler (ie one where the
body has yet to be loaded) would render a broken image.
Update URL for Stanford JavaScript Crypto Library
Update docs for 'has' filter operator
Add Simon Baird to Contributor Licence Agreement