Add docs for Relation initialize, create and create!
Add docs for Relation initialize, create and create!

betesh/rails,travisofthenorth/rails,bogdanvlviv/rails,arjes/rails,deraru/rails,BlakeWilliams/rails,alecspopa/rails,printercu/rails,fabianoleittes/rails,EmmaB/rails-1,gcourtemanche/rails,kaspth/rails,mijoharas/rails,bradleypriest/rails,amoody2108/TechForJustice,bradleypriest/rails,kaspth/rails,kaspth/rails,assain/rails,mohitnatoo/rails,felipecvo/rails,gfvcastro/rails,printercu/rails,samphilipd/rails,shioyama/rails,ttanimichi/rails,yhirano55/rails,bradleypriest/rails,gcourtemanche/rails,rails/rails,yawboakye/rails,pschambacher/rails,yasslab/railsguides.jp,coreyward/rails,rbhitchcock/rails,Stellenticket/rails,joonyou/rails,Sen-Zhang/rails,BlakeWilliams/rails,mtsmfm/rails,kenta-s/rails,yalab/rails,lcreid/rails,kachick/rails,mtsmfm/railstest,eileencodes/rails,tjschuck/rails,xlymian/rails,lcreid/rails,voray/rails,sealocal/rails,rails/rails,mtsmfm/railstest,hanystudy/rails,georgeclaghorn/rails,sergey-alekseev/rails,marklocklear/rails,yalab/rails,gauravtiwari/rails,koic/rails,gavingmiller/rails,ledestin/rails,lucasmazza/rails,arjes/rails,yawboakye/rails,felipecvo/rails,tgxworld/rails,yahonda/rails,Envek/rails,baerjam/rails,sealocal/rails,untidy-hair/rails,tjschuck/rails,richseviora/rails,Spin42/rails,notapatch/rails,esparta/rails,ngpestelos/rails,mijoharas/rails,stefanmb/rails,bogdanvlviv/rails,aditya-kapoor/rails,mathieujobin/reduced-rails-for-travis,Spin42/rails,EmmaB/rails-1,gcourtemanche/rails,mathieujobin/reduced-rails-for-travis,betesh/rails,eileencodes/rails,sergey-alekseev/rails,notapatch/rails,sealocal/rails,samphilipd/rails,rafaelfranca/omg-rails,tgxworld/rails,vassilevsky/rails,illacceptanything/illacceptanything,palkan/rails,rafaelfranca/omg-rails,travisofthenorth/rails,koic/rails,Erol/rails,odedniv/rails,repinel/rails,mtsmfm/rails,samphilipd/rails,ttanimichi/rails,esparta/rails,maicher/rails,kmayer/rails,tijwelch/rails,coreyward/rails,maicher/rails,kddeisz/rails,iainbeeston/rails,schuetzm/rails,alecspopa/rails,flanger001/rails,jeremy/rails,georgeclaghorn/rails,yahonda/rails,tijwelch/rails,fabianoleittes/rails,bolek/rails,Edouard-chin/rails,illacceptanything/illacceptanything,joonyou/rails,BlakeWilliams/rails,MSP-Greg/rails,prathamesh-sonpatki/rails,ngpestelos/rails,aditya-kapoor/rails,deraru/rails,xlymian/rails,MSP-Greg/rails,kmcphillips/rails,Envek/rails,kirs/rails-1,yhirano55/rails,tjschuck/rails,felipecvo/rails,Spin42/rails,Erol/rails,marklocklear/rails,bogdanvlviv/rails,elfassy/rails,kenta-s/rails,kirs/rails-1,travisofthenorth/rails,pvalena/rails,voray/rails,betesh/rails,brchristian/rails,riseshia/railsguides.kr,iainbeeston/rails,pschambacher/rails,mijoharas/rails,kmcphillips/rails,notapatch/rails,repinel/rails,Stellenticket/rails,yawboakye/rails,eileencodes/rails,riseshia/railsguides.kr,untidy-hair/rails,Erol/rails,utilum/rails,assain/rails,MichaelSp/rails,lcreid/rails,vipulnsward/rails,repinel/rails,printercu/rails,gauravtiwari/rails,flanger001/rails,vipulnsward/rails,utilum/rails,gfvcastro/rails,Envek/rails,shioyama/rails,matrinox/rails,deraru/rails,MichaelSp/rails,lucasmazza/rails,maicher/rails,illacceptanything/illacceptanything,hanystudy/rails,illacceptanything/illacceptanything,tgxworld/rails,alecspopa/rails,yasslab/railsguides.jp,BlakeWilliams/rails,Sen-Zhang/rails,koic/rails,esparta/rails,voray/rails,richseviora/rails,illacceptanything/illacceptanything,stefanmb/rails,arjes/rails,kddeisz/rails,prathamesh-sonpatki/rails,pschambacher/rails,iainbeeston/rails,iainbeeston/rails,gfvcastro/rails,ledestin/rails,riseshia/railsguides.kr,travisofthenorth/rails,notapatch/rails,kamipo/rails,Vasfed/rails,gavingmiller/rails,kddeisz/rails,esparta/rails,fabianoleittes/rails,xlymian/rails,aditya-kapoor/rails,pvalena/rails,riseshia/railsguides.kr,georgeclaghorn/rails,assain/rails,illacceptanything/illacceptanything,mechanicles/rails,kirs/rails-1,rbhitchcock/rails,mechanicles/rails,schuetzm/rails,Vasfed/rails,kenta-s/rails,kamipo/rails,schuetzm/rails,aditya-kapoor/rails,kachick/rails,88rabbit/newRails,mechanicles/rails,printercu/rails,mtsmfm/rails,rails/rails,starknx/rails,utilum/rails,joonyou/rails,arunagw/rails,mtsmfm/railstest,kachick/rails,matrinox/rails,rails/rails,Edouard-chin/rails,fabianoleittes/rails,brchristian/rails,prathamesh-sonpatki/rails,shioyama/rails,flanger001/rails,shioyama/rails,Erol/rails,odedniv/rails,starknx/rails,yasslab/railsguides.jp,richseviora/rails,illacceptanything/illacceptanything,arunagw/rails,kmcphillips/rails,rafaelfranca/omg-rails,ttanimichi/rails,pvalena/rails,marklocklear/rails,Vasfed/rails,flanger001/rails,vipulnsward/rails,illacceptanything/illacceptanything,jeremy/rails,deraru/rails,MSP-Greg/rails,vassilevsky/rails,rbhitchcock/rails,yahonda/rails,yawboakye/rails,kddeisz/rails,coreyward/rails,Envek/rails,pvalena/rails,hanystudy/rails,lucasmazza/rails,illacceptanything/illacceptanything,mathieujobin/reduced-rails-for-travis,untidy-hair/rails,baerjam/rails,MichaelSp/rails,Stellenticket/rails,lcreid/rails,illacceptanything/illacceptanything,yalab/rails,palkan/rails,mohitna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