rework summary attribute
rework summary attribute

*   write summary property in modern style
*   introduce get_summary which is memoizable, based on localsiteurl
*   introduce get_siteurl

douglaskastle/pelican,joetboole/pelican,iKevinY/pelican,koobs/pelican,catdog2/pelican,kernc/pelican,iurisilvio/pelican,lazycoder-ru/pelican,HyperGroups/pelican,goerz/pelican,getpelican/pelican,zackw/pelican,eevee/pelican,getpelican/pelican,alexras/pelican,ingwinlu/pelican,janaurka/git-debug-presentiation,ls2uper/pelican,treyhunner/pelican,iurisilvio/pelican,UdeskDeveloper/pelican,UdeskDeveloper/pelican,51itclub/pelican,goerz/pelican,karlcow/pelican,kernc/pelican,levanhien8/pelican,talha131/pelican,Rogdham/pelican,jimperio/pelican,deanishe/pelican,TC01/pelican,karlcow/pelican,JeremyMorgan/pelican,number5/pelican,zackw/pelican,karlcow/pelican,deved69/pelican-1,btnpushnmunky/pelican,rbarraud/pelican,sunzhongwei/pelican,ehashman/pelican,kennethlyn/pelican,TC01/pelican,garbas/pelican,ehashman/pelican,number5/pelican,jimperio/pelican,goerz/pelican,Rogdham/pelican,11craft/pelican,ls2uper/pelican,jvehent/pelican,GiovanniMoretti/pelican,number5/pelican,gymglish/pelican,douglaskastle/pelican,farseerfc/pelican,iKevinY/pelican,garbas/pelican,koobs/pelican,gymglish/pelican,lucasplus/pelican,jo-tham/pelican,btnpushnmunky/pelican,Summonee/pelican,btnpushnmunky/pelican,Summonee/pelican,Summonee/pelican,sunzhongwei/pelican,catdog2/pelican,janaurka/git-debug-presentiation,11craft/pelican,jvehent/pelican,jvehent/pelican,zackw/pelican,HyperGroups/pelican,rbarraud/pelican,simonjj/pelican,iurisilvio/pelican,ls2uper/pelican,garbas/pelican,Scheirle/pelican,GiovanniMoretti/pelican,crmackay/pelican,ingwinlu/pelican,janaurka/git-debug-presentiation,simonjj/pelican,HyperGroups/pelican,joetboole/pelican,Scheirle/pelican,talha131/pelican,kernc/pelican,kennethlyn/pelican,crmackay/pelican,lucasplus/pelican,sunzhongwei/pelican,florianjacob/pelican,abrahamvarricatt/pelican,JeremyMorgan/pelican,abrahamvarricatt/pelican,UdeskDeveloper/pelican,levanhien8/pelican,jo-tham/pelican,ehashman/pelican,treyhunner/pelican,deved69/pelican-1,JeremyMorgan/pelican,eevee/pelican,koobs/pelican,alexras/pelican,douglaskastle/pelican,farseerfc/pelican,rbarraud/pelican,deanishe/pelican,simonjj/pelican,catdog2/pelican,Polyconseil/pelican,jimperio/pelican,gymglish/pelican,51itclub/pelican,deved69/pelican-1,Rogdham/pelican,51itclub/pelican,crmackay/pelican,alexras/pelican,sunzhongwei/pelican,abrahamvarricatt/pelican,florianjacob/pelican,florianjacob/pelican,Polyconseil/pelican,lucasplus/pelican,lazycoder-ru/pelican,avaris/pelican,kennethlyn/pelican,levanhien8/pelican,lazycoder-ru/pelican,joetboole/pelican,TC01/pelican,deanishe/pelican,GiovanniMoretti/pelican,treyhunner/pelican,Scheirle/pelican,avaris/pelican,eevee/pelican,11craft/pelican