Removed Makefile

It's just not needed anymore.

Signed-off-by: Nils Hasenbanck <nils@hasenbanck.de>
Added Mat4.NewProjectionMatrix()

This acts as a replacement for the old gluPerspective.

Signed-off-by: Nils Hasenbanck <nils@hasenbanck.de>
Used 'go fmt' on sources.

Signed-off-by: Nils Hasenbanck <nils@hasenbanck.de>