Merge pull request #166 from kamalpreetgrewal/master

connects every document to its view
implements insert image
Merge pull request #167 from bhattigurjot/master

implements insert image
corrects the selection of circle and line
Merge pull request #171 from bhattigurjot/master

corrects the selection of circle and line
connects cut/copy/paste from edit menu
corrects height of menubar
Merge pull request #172 from ChanKaur/chan

connects cut/copy paste from edit menu