User theme prototype no longer pollutes studio widgets
Adds error check in remoteType
Adds unified import/export

Projects, themes and custom components now export using a single
command that builds a zip file containing
* project
* projecttemplate
* components
* themes

There is now a single Import command/dialog that imports
a zip file of this structure and handles all of the elements.
Merge branch 'master' of https://github.com/SpringSource/wavemaker