Improve uniqueness of feed entry ID
Improve uniqueness of feed entry ID

The ID of a feed entry should never change, but the previous method of
generating the ID -- i.e., using the entry URL -- results in an ID that
is not permanent and can change. Switching to the tag URI method from
RFC 4151 should help improve the long-term uniqueness and permanence of
entry IDs, as espoused here:
<http://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id>

Also added a trailing slash to the site URL inside the feed; the lack
thereof was causing a feed validation warning.

TC01/pelican,talha131/pelican,GiovanniMoretti/pelican,kennethlyn/pelican,number5/pelican,treyhunner/pelican,btnpushnmunky/pelican,HyperGroups/pelican,farseerfc/pelican,goerz/pelican,liyonghelpme/myBlog,catdog2/pelican,11craft/pelican,janaurka/git-debug-presentiation,jvehent/pelican,iKevinY/pelican,sunzhongwei/pelican,liyonghelpme/myBlog,kernc/pelican,sunzhongwei/pelican,deved69/pelican-1,garbas/pelican,ingwinlu/pelican,alexras/pelican,Summonee/pelican,alexras/pelican,liyonghelpme/myBlog,rbarraud/pelican,goerz/pelican,HyperGroups/pelican,lazycoder-ru/pelican,number5/pelican,koobs/pelican,0xMF/pelican,gymglish/pelican,eevee/pelican,deved69/pelican-1,Rogdham/pelican,jo-tham/pelican,deanishe/pelican,UdeskDeveloper/pelican,avaris/pelican,farseerfc/pelican,fbs/pelican,crmackay/pelican,Rogdham/pelican,51itclub/pelican,simonjj/pelican,sunzhongwei/pelican,btnpushnmunky/pelican,ehashman/pelican,gymglish/pelican,kennethlyn/pelican,lucasplus/pelican,ls2uper/pelican,catdog2/pelican,jimperio/pelican,karlcow/pelican,jimperio/pelican,liyonghelpme/myBlog,JeremyMorgan/pelican,JeremyMorgan/pelican,douglaskastle/pelican,florianjacob/pelican,51itclub/pelican,ehashman/pelican,levanhien8/pelican,getpelican/pelican,deved69/pelican-1,rbarraud/pelican,zackw/pelican,Summonee/pelican,iurisilvio/pelican,iurisilvio/pelican,kennethlyn/pelican,kernc/pelican,iurisilvio/pelican,abrahamvarricatt/pelican,goerz/pelican,karlcow/pelican,ls2uper/pelican,treyhunner/pelican,jo-tham/pelican,deanishe/pelican,karlcow/pelican,deanishe/pelican,liyonghelpme/myBlog,GiovanniMoretti/pelican,Rogdham/pelican,TC01/pelican,lucasplus/pelican,florianjacob/pelican,crmackay/pelican,Summonee/pelican,jvehent/pelican,garbas/pelican,sunzhongwei/pelican,Polyconseil/pelican,lazycoder-ru/pelican,jvehent/pelican,alexras/pelican,joetboole/pelican,Scheirle/pelican,zackw/pelican,florianjacob/pelican,kernc/pelican,11craft/pelican,crmackay/pelican,eevee/pelican,rbarraud/pelican,douglaskastle/pelican,iKevinY/pelican,TC01/pelican,catdog2/pelican,levanhien8/pelican,levanhien8/pelican,Scheirle/pelican,Scheirle/pelican,douglaskastle/pelican,jimperio/pelican,talha131/pelican,janaurka/git-debug-presentiation,ingwinlu/pelican,janaurka/git-debug-presentiation,getpelican/pelican,justinmayer/pelican,abrahamvarricatt/pelican,avaris/pelican,JeremyMorgan/pelican,51itclub/pelican,gymglish/pelican,GiovanniMoretti/pelican,eevee/pelican,abrahamvarricatt/pelican,UdeskDeveloper/pelican,lucasplus/pelican,koobs/pelican,11craft/pelican,joetboole/pelican,joetboole/pelican,ls2uper/pelican,simonjj/pelican,UdeskDeveloper/pelican,number5/pelican,btnpushnmunky/pelican,Polyconseil/pelican,treyhunner/pelican,ionelmc/pelican,ehashman/pelican,lazycoder-ru/pelican,koobs/pelican,HyperGroups/pelican,arty-name/pelican,zackw/pelican,Natim/pelican,garbas/pelican,simonjj/pelican