While it is possible to think up any number of scenarios by which terrorists would attempt to use Ebola, I will not engage in that exercise. I will continue to limit my comments to my area of expertise, the natural course of infection.
From there, infection would be likely along natural pathways through human contact, and the outbreak would build from there.
Unless, of course the sick jihadi picked a crowded venue to blow themselves up in.
Then you'd have aerosols, direct fluid contact, piece to person contact, and fomites all in one mess, and with the addition of shrapnel, plenty of open wounds among the initial survivors, and contamination of medical personnel and first responders, among others.
That precedent exists, at least in attempt, sans pathogen. (http://www.freerepublic.com/focus/f-news/1497194/posts)