Model generator USAGE doc improved
Model generator USAGE doc improved

 * Added information about syntax for precision/scale of decimals
 * Removed incorrect information about being able to set `default`
 * Added more examples of usage

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