bug fixes in Car.move() (not finished yet)

also changed default green time value from 10 to 6
still trying to fix bugs
Fixed method move()
minor fix
Merge remote-tracking branch 'origin/ashish'
major fixes

-implemented clear grid
-fixed adding crossings (draging)
-slight changes in designer
-fixed problem when resetting crossing
selectCrossing on the screen
partial select crossing and delete crossing

showing the information on the side pane has to be done
deleting crossing needs to improve merging deletion also
design changes
merge with master
fixes in GUI
more changes...

still cant save
Use menu items to add crossing