Fix default parameter in TableRow constructor

Add type parameter to default constructor angument in scalafx.scene.control.TableRow constructor, which otherwise resolved to jfxsc.TableRow[Nothing], causing type error
Fix TableView's columnResizePolicy and rowFactory

Fix erroneous implementation of assignment to columnResizePolicy and
rowFactory in TableView (copied it from TableColumn's cellFactory).
Previous version was effectively throwing the value away.
Merge pull request #150 from ezoerner/SFX-2

apply methods in RadialGradient companion object should have return type...
Merge pull request #144 from nigredo-tori/patch-1

Fix default argument in TableRow constructor
Merge pull request #145 from nigredo-tori/TableViewFix

Fix TableView's columnResizePolicy and rowFactory
Fixes for issue #153 - Implicit conversions SFX to/from JFX should allow `null` arguments