Fixed the following isseus:
1. Close Disk Image menu is working now
2. A new disk image can be opened without closing the existing one.
3. No more escape charactes in the image-info window.
Merge pull request #82 from sunithamisra/master

Fixed the following isseus:


    Close Disk Image menu is working now
    A new disk image can be opened without closing the existing one.
    No more escape charactes in the image-info window.