Renamed icon to ninja_icon.png and fixed desktop icon path
Fixed .qrc resource file to point at updated icon name
Revert "Fixed .qrc resource file to point at updated icon name"

This reverts commit 8446d388d80d97c6e20ad78cb8fe75ab5d395a22.
Updated icon names in .qrc resource file
Merge pull request #1599 from krnekhelesh/master

Renamed icon to ninja_icon.png and fixed desktop icon path