manage command for updating members url_img

the new url_img is fetched frm the http://www.knesset.gov.il/ site
fix bug: commitee detail view only shows presence of members that are officially members of the committee.
improve detection of mks attending a meeting: deal with yet another form of writing who wrote the protocol, which we use as a terminator for the place to look for attending mks.
add event 'which' to the template, so committee names appear in the upcoming events in the main page
Merge branch 'master' of https://github.com/shimrite/Open-Knesset into mkimages
some cleanup in update_mks_url_img command