tested how to click in vertex
remove edges from subtree
removed all edges from subtree
fixed bug
removed nodes from subtree
removed nodes+edges from grpah after clicking (there is a problem with vertex)
changes requested by fuc
implemented changes as they were requested in issue #34
global format, previous format has been criticized
added coverage computation for remaining nodes
zoom in and center work
test fixes at arithmeticunary and assignment nodes
Merge branch 'master' of github.com:swp-uebersetzerbau-ss13/javabite into backend-m3

Conflicts:
	.gitignore
Merge branch 'dev' of github.com:swp-uebersetzerbau-ss13/javabite into backend-m3
updated common