Update the "how to contribute" docs with py3k info.
Update the "how to contribute" docs with py3k info.

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