Add cover images: Ecog, JAV, NJB, Oikos, plos, pp, sbot
Rename sbot -> sysbot
Update recently integrated: oikos,pp,sysbot,plos*
Add markup for covers oikos,pp,sysbot,ecog,jav,njb
Fix PLOS search query
Merge pull request #807 from dleehr/journal-covers

Update Journal covers 2014-12-01