Proper MIME type for image.png.  Relabel to 2.4-preAlpha.
Proper MIME type for image.png.  Relabel to 2.4-preAlpha.

ryanramage/svg-editor,trentmillar/ddp-level-editor,trentmillar/ddp-level-editor,ryanramage/svg-editor,trentmillar/ddp-level-editor,ryanramage/svg-editor