Support multiple jfmfs on a page

[gruszczy]

Original title: too many ids in generated html

All divs generated by jfmfs have ids, like: jfmfs-friend-selector, jfmfs-inner-header, jfmfs-friend-container, etc. This is pretty inconvenient, since I have two of those selectors on a single page, so a conflict is inevitable. How about changing them to classes?

[pravse]

+1. I ran into this issue as well.