Now with SplitPane

Split up FeedLoader into DateUtil, DocumentLoader ,ObjectUtil, StringUtil and XPathUtil
Fixed all findbugs findings
Added Javadoc pretty much everywhere
Added a SplitPane to the View
The linkButton is now full width which required me to wrap it in an AnchorPane
Wrote unittests, which revealed how slow retrieving a TimeZone by id really is
Used jsr305 to add Nonnull and Nullable annotations which revealed a few errors in the code
Added some assertions here and there