[SCIFIO] Minimal Service Setup for ImgOpener

[Johannes Schindelin]

Hi Mark,

On Wed, 25 Sep 2013, Mark Hiner wrote:

> Anyway, I think a case could be made for warning when things extend
> SciJavaService, but I think there's the chance for such a warning to be
> confusing if a case arises where scijava-common functionality is truly
> being extended, because doing so isn't strictly wrong.

True. Color me convinced that the warning should not be there.

Ciao,
Dscho