Update video url
updating README
Merge branch '0.2.x'

Conflicts:
	README.md
	data/about.json
Use master branches.
Merge branch 'master' of https://github.com/elifesciences/lens
Use PanelFactory to control panels.
Specify associated reference types in panel specs.
Moved substance-reader into lens.
Merge branch 'master' into lens_next

Conflicts:
	project.json