Add 'runtimes' property to the environments
Add the ability to specify runtimes in the url, in case it's ever
needed.
Change filtering to use the runtimes
Updates properties files. endpoints becomes runtimes.
Go back to using OR on the runtimes, rather than AND.

e.g. 
runtimes=x,y means x OR y is required, not x AND y.
Samples restructured and some properties files added/updated
accordingly.
Merge pull request #376 from fmoloney/runtimeFiltering

Runtime filtering
Leave the old constructor until the playground environment is updated.
Merge pull request #377 from fmoloney/runtimeFiltering

Leave the old constructor until the playground environment is updated.
Add support for relative file names to the sbt/text and sbt/i18n modules
in dojo143
Update the controls etc to use relative paths to their templates
Doc typo
Noticed this dodgy filename
neater
Remove debug code...
Merge pull request #380 from fmoloney/relativePluginUrls

Relative plugin urls
Merge pull request #381 from priand/playground

Playground changes
Made the playground working with the runtime filters instead of the
endpoints