When scaling Bitmaps nmeGetObjectUnderPoint() didn't used the scaling correctly while comparing the local mouse position with the dimensions of the bitmap. The local position is calculated without any scaling (that's correct) whereas the compared width or height  already includes the scaling (that's incorrect).
Merge pull request #22 from cyantree/hotfix/bitmap-scale

Bitmap.nmeGetObjectUnderPoint() works incorrectly when bitmap has been scaled