Fixes #57: Build failure due to missing Javadoc reference. 
http://github.com/mysticfall/pivot4j/issues/issue/57
Handle restoration of an empty model.
Prepare for the 0.7 release.
[maven-release-plugin] prepare release pivot4j-0.7
[maven-release-plugin] prepare for next development iteration
Restructure as a Maven multi-module project.
Delete an unnecessary file.
Remove duplicated sample data file.
Fix missing source and javadoc artifacts.
Fix download link URLs.
Update documentation to reflect the current project structure.
Switch gh-pages methods to Wagon GitSite.
Fixes #43 : Need an easier way to provide credentials to data source.
Make certain data source types explicitly closeable.
Remove version tags for bundled plugins.
#63 : Make data source definitions and themes configurable.
Add theme switcher to the main toolbar.
Revert default theme to 'cruze'.
Remove unused source folder reference.
Remove IDE warning messages.