SRS update - kleine änderungen

Funktionale Anforderungen: Style, Kanten-Hightlighting mouseover
Merge pull request #64 from MatthiasKraus/master

srs update
SRS Update
Merge pull request #68 from MatthiasKraus/master

SRS Update
quicksave
SRS Update 1.3
new master
SDD Update 1.2
mit srs
Matze M edits SDD v 1.2 and proved ISGCIGraph.java, CustonGraph must be refactored to fit that; changed policy for implementing ISGCIGraph by deleting Node/Edgeview and using mxgraph for drawing, but we also need SimpleDirectedGraph.java for using JGraphT, that computes all necessary information for adding neighbours/super/subclasses and drawing graphs in general greez