renamed api package to 'rest'.
updated app definition class to search correct package for resources.
added package-info for model package.
Added RootResource for URI mediation.
Added CloudResource to serve the cloud page.
stubbed CloudResource
Created analysis pipeline interfaces
Changed the Analyzer, Filter and Parser interfaces back to classes (we
don't want to get too abstract too early).
Implemented the initial filter and parser to accept only letters and
split on whitespace, respectively.
Added AnalysisPipeline, the facade/mediator which brings everything
together.