Added get_next_by_order and get_previous_by_order methods to the Orderable model.
Added get_next_by_order and get_previous_by_order methods to the Orderable model.

ryneeverett/mezzanine,nikolas/mezzanine,dsanders11/mezzanine,dustinrb/mezzanine,guibernardino/mezzanine,emile2016/mezzanine,dsanders11/mezzanine,SoLoHiC/mezzanine,vladir/mezzanine,ryneeverett/mezzanine,christianwgd/mezzanine,geodesign/mezzanine,saintbird/mezzanine,theclanks/mezzanine,douglaskastle/mezzanine,frankier/mezzanine,batpad/mezzanine,biomassives/mezzanine,geodesign/mezzanine,ZeroXn/mezzanine,agepoly/mezzanine,eino-makitalo/mezzanine,promil23/mezzanine,jjz/mezzanine,wbtuomela/mezzanine,gradel/mezzanine,nikolas/mezzanine,sjuxax/mezzanine,douglaskastle/mezzanine,AlexHill/mezzanine,Cajoline/mezzanine,jjz/mezzanine,webounty/mezzanine,sjuxax/mezzanine,wbtuomela/mezzanine,joshcartme/mezzanine,eino-makitalo/mezzanine,readevalprint/mezzanine,webounty/mezzanine,saintbird/mezzanine,wyzex/mezzanine,PegasusWang/mezzanine,promil23/mezzanine,batpad/mezzanine,molokov/mezzanine,Kniyl/mezzanine,gbosh/mezzanine,vladir/mezzanine,nikolas/mezzanine,jjz/mezzanine,gradel/mezzanine,SoLoHiC/mezzanine,orlenko/plei,ryneeverett/mezzanine,mush42/mezzanine,sjuxax/mezzanine,industrydive/mezzanine,fusionbox/mezzanine,wrwrwr/mezzanine,Skytorn86/mezzanine,gradel/mezzanine,SoLoHiC/mezzanine,ZeroXn/mezzanine,spookylukey/mezzanine,viaregio/mezzanine,PegasusWang/mezzanine,orlenko/sfpirg,PegasusWang/mezzanine,stbarnabas/mezzanine,spookylukey/mezzanine,sjdines/mezzanine,biomassives/mezzanine,adrian-the-git/mezzanine,Cajoline/mezzanine,saintbird/mezzanine,scarcry/snm-mezzanine,douglaskastle/mezzanine,joshcartme/mezzanine,Cicero-Zhao/mezzanine,orlenko/sfpirg,AlexHill/mezzanine,jerivas/mezzanine,dekomote/mezzanine-modeltranslation-backport,vladir/mezzanine,theclanks/mezzanine,stephenmcd/mezzanine,fusionbox/mezzanine,stephenmcd/mezzanine,ZeroXn/mezzanine,mush42/mezzanine,agepoly/mezzanine,dustinrb/mezzanine,tuxinhang1989/mezzanine,adrian-the-git/mezzanine,molokov/mezzanine,emile2016/mezzanine,Kniyl/mezzanine,damnfine/mezzanine,dekomote/mezzanine-modeltranslation-backport,jerivas/mezzanine,industrydive/mezzanine,industrydive/mezzanine,wbtuomela/mezzanine,dekomote/mezzanine-modeltranslation-backport,Kniyl/mezzanine,sjdines/mezzanine,webounty/mezzanine,sjdines/mezzanine,dsanders11/mezzanine,dovydas/mezzanine,Cicero-Zhao/mezzanine,eino-makitalo/mezzanine,wyzex/mezzanine,damnfine/mezzanine,adrian-the-git/mezzanine,promil23/mezzanine,orlenko/plei,cccs-web/mezzanine,viaregio/mezzanine,dovydas/mezzanine,jerivas/mezzanine,viaregio/mezzanine,readevalprint/mezzanine,frankchin/mezzanine,gbosh/mezzanine,christianwgd/mezzanine,frankier/mezzanine,geodesign/mezzanine,orlenko/sfpirg,wrwrwr/mezzanine,stbarnabas/mezzanine,orlenko/plei,theclanks/mezzanine,frankchin/mezzanine,readevalprint/mezzanine,dovydas/mezzanine,scarcry/snm-mezzanine,molokov/mezzanine,mush42/mezzanine,wyzex/mezzanine,damnfine/mezzanine,agepoly/mezzanine,spookylukey/mezzanine,tuxinhang1989/mezzanine,stephenmcd/mezzanine,guibernardino/mezzanine,emile2016/mezzanine,Cajoline/mezzanine,joshcartme/mezzanine,Skytorn86/mezzanine,frankier/mezzanine,Skytorn86/mezzanine,scarcry/snm-mezzanine,frankchin/mezzanine,biomassives/mezzanine,tuxinhang1989/mezzanine,christianwgd/mezzanine,gbosh/mezzanine,dustinrb/mezzanine,cccs-web/mezzanine