Refactor boot.js module execution code

The aim is to expose the underlying cross-platform evalGlobal and
evalSandboxed.

Also adding the capability for a tiddlywiki.files file to specify a
prefix to be added to the text of a file.
Use the text parser to parse CSS
First version of testing plugin based on Jasmine

It will need some cleaning up here and there, but at this point works
cross-platform
Add a test edition and associated script