Fix link to ImgOpener.java with the move of imglib2/ to io/
Merge pull request #500 from sbesson/rebased/develop/imglib2_link

Fix link to ImgOpener.java with the move of imglib2/ to io/ (rebased onto develop)
Restrict ImageJ version to < 1.47o

This prevents us from running into a bug in ImageStack introduced in
1.47o.
Merge pull request #502 from melissalinkert/imagej-version

Restrict ImageJ version to < 1.47o
Merge remote-tracking branch 'gh-ome/develop' into in-steps-bf