window.onfocus before article image sizing
window.onfocus before article image sizing

This PR delays the calculation of the article image size until the window receives the `onfocus` event. The article image was obscuring a viewport's worth of content when following inbound `target="_blank"` links because the image height was being calculated before it was visible.
adamcroom/mediator,t-p/mediator,Sweetman/mediator,eleyine/RedditComics,echelonprogram/echelonprogram.github.io,htuomola/htuomola.github.com,pinak/pinak.github.io,syrusakbary-pages/gilmarestafa,serbrech/blog,htuomola/htuomola.github.com,Jacksay/mediator,serbrech/blog,htuomola/mediator,teotwaki/jekyll-blog,rougier/mediator,greggcorp/greggcorp.github.io,billowdood/billowdood.github.io,rougier/mediator,NielsKoole/nielskoole.github.io,greggcorp/greggcorp.github.io,teotwaki/jekyll-blog,dataflows/dataflows.github.io,greggcorp/greggcorp.github.io,syrusakbary-pages/gilmarestafa,tobysoby/tobysoby.github.io,mandygross/mandygross.github.io,Sweetman/mediator,samarthmed/samarthmed.github.io,lindenguynn/lindenguynn.github.io,FTWynn/mediator,hanxiao/mediator,sameera207/sameera207.github.io,datacite/blog,prateekmehta/prateekmehta.github.io,adamcroom/mediator,usbsnowcrash/mediator,shekarrex/mediator,ristovskiv/mediator,billowdood/billowdood.github.io,grantnicholas/grantnicholas.github.io,TheOpenBook/theopenbook.github.io,mikebellistri/mikebellistri.github.io,Sweetman/mediator,timklapdor/inhale,mandygross/mandygross.github.io,ristovskiv/mediator,nnarhinen/narhinen.net,prateekmehta/prateekmehta.github.io,grantnicholas/grantnicholas.github.io,fabionobre/mediator,devgeek27/devgeek27.github.io-old,datacite/blog,devgeek27/devgeek27.github.io-old,inroly/inroly.github.io,shekarrex/mediator,grantnicholas/grantnicholas.github.io,inroly/inroly.github.io,tcyrus/tcyrus.github.io,sameera207/sameera207.github.io,htuomola/mediator,ksashikumar/ksashikumar.github.io,TheOpenBook/theopenbook.github.io,jsononrails/jsononrails.github.io,tcyrus/tcyrus.github.io,gguerini/gguerini.com,NielsKoole/nielskoole.github.io,clockwork189/clockwork189.github.io,TheOpenBook/theopenbook.github.io,samarthmed/samarthmed.github.io,eleyine/RedditComics,mikebellistri/mikebellistri.github.io,htuomola/mediator,fabionobre/mediator,pinak/pinak.github.io,jsononrails/jsononrails.github.io,NielsKoole/nielskoole.github.io,echelonprogram/echelonprogram.github.io,lancevo/lancevo.github.io,narenst/mediator,shekarrex/mediator,nnarhinen/narhinen.net,ercardenas/ercardenas.github.io,morav/morav.github.io,htuomola/htuomola.github.com,clockwork189/clockwork189.github.io,mikebellistri/mikebellistri.github.io,lindenguynn/lindenguynn.github.io,ccbndh/ccbndh.github.io,usbsnowcrash/mediator,salgotrav/salgotrav.github.io,timklapdor/inhale,mootwoot/mootwoot.github.io,junaidk/mediator,inroly/inroly.github.io,ercardenas/ercardenas.github.io,t-p/mediator,tobysoby/tobysoby.github.io,samarthmed/samarthmed.github.io,jsononrails/jsononrails.github.io,echelonprogram/echelonprogram.github.io,syrusakbary-pages/gilmarestafa,FTWynn/mediator,usbsnowcrash/mediator,datacite/blog,Jacksay/mediator,hanxiao/mediator,dataflows/dataflows.github.io,pinak/pinak.github.io,ercardenas/ercardenas.github.io,teotwaki/jekyll-blog,nnarhinen/narhinen.net,ksashikumar/ksashikumar.github.io,salgotrav/salgotrav.github.io,gguerini/gguerini.com,tobysoby/tobysoby.github.io,ksashikumar/ksashikumar.github.io,mootwoot/mootwoot.github.io,junaidk/mediator,FTWynn/mediator,fabionobre/mediator,narenst/mediator,t-p/mediator,serbrech/blog