Improvements in in-place editors rendering and keeping preview properties general, independent of Legend module existence.
Notes about refactorization needs.
Merge branch 'legend-maven' of git://github.com/vijeshm/gephi-gsoc13-legendmodule into legend-maven

Conflicts:
	modules/DesktopPreview/src/main/java/org/gephi/desktop/preview/PreviewSketch.java
	modules/LegendAPI/src/main/java/org/gephi/legend/inplaceeditor/InplaceItemRenderer.java
	modules/LegendAPI/src/main/java/org/gephi/legend/mouse/LegendMouseListener.java
	modules/PreviewAPI/src/main/java/org/gephi/preview/PreviewModelImpl.java
	modules/PreviewAPI/src/main/java/org/gephi/preview/api/PreviewProperty.java