@ clean test,svg
+ add parser method for rectangle (not functionnal)
+ add parser method for text (not functionnal)
@ clean test,svg
+ add rect class
+ add text with tspan in text.svg
+ create text class
+ add tspan file for tspan class
+ parse text nodes
+ add tspan class
@ parse tspan in text class as childs
+ add ToJSON function to tspan and text classes
@ fix bug on toJSON function
+ complete group.toJSON
@ update matrix class with latest version of snap.svg