adds links for slides and their source
adds links for slides and their source

jamesbroadhead/pyconuk.org,jneves/pyconuk.org,jneves/pyconuk.org,sixty-north/pyconuk.org,Avaren/pyconuk.org,wjt/pyconuk.org,snim2/pyconuk.org,Avaren/pyconuk.org,helenst/pyconuk.org,snim2/pyconuk.org,jamesbroadhead/pyconuk.org,PyconUK/pyconuk.org,tomviner/pyconuk.org,helenst/pyconuk.org,wjt/pyconuk.org,jneves/pyconuk.org,PyconUK/2015.pyconuk.org,moreati/pyconuk.org,jamesbroadhead/pyconuk.org,tomviner/pyconuk.org,grimpunch/pyconuk.org,zeth/pyconuk.org,moreati/pyconuk.org,BjarniRunar/pyconuk.org,Avaren/pyconuk.org,sixty-north/pyconuk.org,grimpunch/pyconuk.org,zeth/pyconuk.org,zeth/pyconuk.org,sixty-north/pyconuk.org,PyconUK/2015.pyconuk.org,BjarniRunar/pyconuk.org,PyconUK/pyconuk.org,mojones/pyconuk.org,PyconUK/pyconuk.org,helenst/pyconuk.org,tomviner/pyconuk.org,wjt/pyconuk.org,PyconUK/2015.pyconuk.org,snim2/pyconuk.org,mojones/pyconuk.org,mojones/pyconuk.org,evildmp/pyconuk.org,moreati/pyconuk.org,BjarniRunar/pyconuk.org,evildmp/pyconuk.org,evildmp/pyconuk.org,grimpunch/pyconuk.org