added range type bars to legend. Clicking on a bar now prints the first and last occurrence of that group.
added range type bars to legend. Clicking on a bar now prints the first and last occurrence of that group.

rueckstiess/mtools,parkhyeonghwa/mtools,aerrami/mtools,aerrami/mtools,ces0712/mtools,tomzhang/mtools,yaowenqiang/mtools,tomzhang/mtools,devkev/mtools,gormanb/mtools,corymintz/mtools,corymintz/mtools,devkev/mtools,devkev/mtools,tomzhang/mtools,parkhyeonghwa/mtools,gormanb/mtools,ces0712/mtools,gormanb/mtools,rueckstiess/mtools,ces0712/mtools,parkhyeonghwa/mtools,yaowenqiang/mtools,yaowenqiang/mtools,aerrami/mtools,corymintz/mtools