Merge pull request #39 from Mario-S/2.2

2.2
simplified loading of tiles: removed check for start_top/ start_left
some javadoc
Issue #40 : Added date formatting support to the BeanPathAdapter
Fixed problems with NPE when value or format is null
Fixed incorrect behavior when calling requestFocus() on BigDecimalField
CalendarLabel, Label that displays a Calendar and reacts on changes of
DateFormat and Calendar value
improve focus handling
removed the showTime property from CalendarTextField
adding dateFormat and dateFormats to CalendarTimeTextField
optimizablecontentpane added:

- can be used to implement LOD like interfaces (huge performance improvements possible)
- custom optimization rules can be defined
- default rule that uses area & min dimension to optimize
optimizablecontentpane added:

- can be used to implement LOD like interfaces (huge performance improvements possible)
- custom optimization rules can be defined
- default rule that uses area & min dimension to optimize
2.2-r5
JSR310 additions

Conflicts:
	gradle.properties
Merge branch '2.2' of https://github.com/JFXtras/jfxtras-labs.git into 2.2
splitted interface