release 1.3.0

It needs installed Java 1.7+
1.3.0 (01-sep-2016)

• added sorting of attributes in mind map model to keep their order
• added plugin to add an image into a topic
• changed Plugin API
• fixed casual d'n'd topic operations through click over its fold-unfold icon
• added export into SVG image format
• published standalone editor "Scia Reto"
• fixed issue #22, added key short-cut into options to tune "next line char" for topic text editor, by default SHIFT+ENTER