Examine: Karyogram can't hijack scroll

Karyogram gets focus on click, loses it on mouseout.

Also fixes bug with karyogram related to double d3 inclusion.

fixes #129
Examine: CR; naming, move to addEventListener,
Merge pull request #141 from hammerlab/issue-129-disable-karyogram-scroll-until-click

Examine: Karyogram can't hijack scroll