Dependencies: add xalan, increment log4j version
Udpated repository refs; fixed directory creation using File.mkdirs() instead of non-working global mkdir(), artifact of older Gradle versions?
CustomVerifier should return false when non-required number field contains non-numeric text; confirmed through new unit test
Correctly redraw models on OcurrenceTrack when zoom level changes (caching was preventing layout update)
No global units property, grab from model to upate status text on zoom change
Remove file extension from image files when using as section names
Added .gitignore, Eclipse .project