wip
addressed findbugs issues

used jsr305 annotations to show possible null values
some unittests written, lots of refactoring and making it pretier
findbugs fixings
add progress indicator when loading documents
change readme file to include a link to github pages
view source in rightclick menu
using Joda time instances instead of java Date and Calendar
Merge branch 'joda' into dev
Now with SplitPane
Using Joda time instead of java Date and Calendar

* add progress indicator when loading documents
* change readme file to include a link to github pages
* view source in rightclick menu
* use joda time instead of GregorianCalendar and SimpleDateFormat