binary-ops.clj: hinting the labeled-image function
helpers.clj: added is-buffImg function
processing.clj: added 'threshold' function from boof
core.clj: added 'gray-type?' function
helpers.clj: added 'load-file-buffImg' function
core.clj, helpers.clj: corrected 'type?' to 'type'. Also
to-buffered-image now inocuous to BufferedImages