Merge pull request #16 from rajatpatel92/master

AboutUs added, Unnecessary items removed from menubar
Merge pull request #17 from rajatpatel92/master

Case sensitiveness removed from group names
Merge pull request #18 from rajatpatel92/master

Added main window title with version
Redundancy in filemodel while importing zip fixed
Issue fixed related to map iteration
Ready for initial release
added 4 more themes
code reduced, choose theme feature added, proper printing statements added for tracing and for logs
Conflict resolution
Junk removal