Added .gitignore files to top-level project dirs
Added example files for testing
Minor revisions to reduce number of compile warnings
Migrated PageItem and PageModel related classes to the model package
Updated dia.tesseract and .test bundles to reflect new document model
package
Incorporated previous work on thresholding
Removed unneeded jar from classpath
Created bundle to centralize libraries for this project.
Removed jar files form dia.tesseract and updated OSGi dependencies to
reference the main library bundle
Added log4J to exported library packages
Updated org.dharts.dia to use *.dia.libs