Fix jars in NYoSh build.
Preliminary work on FileSet registration. Use virtual packages in the interactive language. Add a model to the Playground to test interactive language.
Update filesets and plugins to the latest snapshots. They offer an API to preview how files will be registered as fileset instances.
Add intention to File to demonstrate how to interface the preview registration API. Remove RegisterFileset concept, the registration is now all done in the Register intention. Update plugins lib.
Rename the preview method. Upgrade plugins jar.
Draft of the FileSelectorButton UI.
Adjust plugin version in IDEA plugin build script.
Merge remote changes, integrating the new ui language into NYoSh. Some cleanup and updates to build script to include this language in the standalone distribution (needs testing).
Merge branch 'master' of bitbucket.org:campagnelaboratory/nyosh

Conflicts:
	build.xml
	languages/org.campagnelab.gobyweb.interactive/languageModels/structure.mps
	solutions/NYoSh.idea3/models/NYoSh/IDEA.mps
Add build.xml to gitignore
Merge branch 'master' of bitbucket.org:campagnelaboratory/nyosh

Conflicts:
	build.xml
	languages/org.campagnelab.gobyweb.interactive/languageModels/structure.mps
	solutions/NYoSh.idea3/models/NYoSh/IDEA.mps
Add a Button UI element and use in the the RegisterFileTool to clear the list of files.
Fix for environment language double generator issue.
Add some more buttons and logic for when to show some buttons and not others.
Remove static method from Script's behavior. It was deprecated in MPS 3.0 and has been removed in 3.1.
Add an intention to PluginRepository to load plugin definitions. The definitons are attached as User Object to the PluginRepository instance. A sample usage is in the PreviewRegister intention of the interactive language.
Move loading and accessing to the plugin definitions in the behavior aspect of PluginRepository.
Improve the plugin repo presentation and interaction (show error messages in clear when an exception occurs).
Improve type handling and transfer information from preview.
Add fileset area reference in editor of RegisterFileSetTool. Tweak the presentation to provide feedback about the result of the preview.