Add modern way to enable asset precompile to guide
Add modern way to enable asset precompile to guide

Capistrano version 3 changed its way to enable asset precompile
during deployment.
This commit doesn't remove old way but only add new way for v3.

eileencodes/rails,repinel/rails,fabianoleittes/rails,schuetzm/rails,yalab/rails,Edouard-chin/rails,gauravtiwari/rails,jeremy/rails,schuetzm/rails,jeremy/rails,starknx/rails,kmcphillips/rails,tjschuck/rails,lcreid/rails,schuetzm/rails,Stellenticket/rails,BlakeWilliams/rails,Erol/rails,gauravtiwari/rails,kddeisz/rails,vipulnsward/rails,tjschuck/rails,fabianoleittes/rails,kmcphillips/rails,yhirano55/rails,repinel/rails,yalab/rails,Edouard-chin/rails,rails/rails,bogdanvlviv/rails,rails/rails,EmmaB/rails-1,yahonda/rails,palkan/rails,jeremy/rails,tjschuck/rails,mechanicles/rails,yhirano55/rails,yahonda/rails,tjschuck/rails,joonyou/rails,rails/rails,georgeclaghorn/rails,prathamesh-sonpatki/rails,Vasfed/rails,joonyou/rails,rafaelfranca/omg-rails,repinel/rails,bogdanvlviv/rails,BlakeWilliams/rails,betesh/rails,notapatch/rails,gauravtiwari/rails,BlakeWilliams/rails,yahonda/rails,lcreid/rails,mechanicles/rails,iainbeeston/rails,bogdanvlviv/rails,yahonda/rails,MSP-Greg/rails,fabianoleittes/rails,mechanicles/rails,esparta/rails,palkan/rails,betesh/rails,lcreid/rails,shioyama/rails,Erol/rails,BlakeWilliams/rails,vipulnsward/rails,jeremy/rails,Erol/rails,notapatch/rails,lcreid/rails,eileencodes/rails,kddeisz/rails,yawboakye/rails,notapatch/rails,kmcphillips/rails,rails/rails,rafaelfranca/omg-rails,fabianoleittes/rails,MSP-Greg/rails,Stellenticket/rails,kmcphillips/rails,prathamesh-sonpatki/rails,kddeisz/rails,starknx/rails,iainbeeston/rails,Erol/rails,eileencodes/rails,Vasfed/rails,eileencodes/rails,yhirano55/rails,starknx/rails,Envek/rails,iainbeeston/rails,Vasfed/rails,tgxworld/rails,mechanicles/rails,Envek/rails,shioyama/rails,MSP-Greg/rails,prathamesh-sonpatki/rails,repinel/rails,Envek/rails,notapatch/rails,esparta/rails,shioyama/rails,MSP-Greg/rails,georgeclaghorn/rails,esparta/rails,kddeisz/rails,Stellenticket/rails,yalab/rails,joonyou/rails,tgxworld/rails,shioyama/rails,Vasfed/rails,yawboakye/rails,vipulnsward/rails,yawboakye/rails,tgxworld/rails,schuetzm/rails,EmmaB/rails-1,betesh/rails,rafaelfranca/omg-rails,yalab/rails,vipulnsward/rails,Edouard-chin/rails,Envek/rails,tgxworld/rails,betesh/rails,Stellenticket/rails,yhirano55/rails,Edouard-chin/rails,bogdanvlviv/rails,palkan/rails,EmmaB/rails-1,palkan/rails,yawboakye/rails,joonyou/rails,georgeclaghorn/rails,esparta/rails,prathamesh-sonpatki/rails,iainbeeston/rails,georgeclaghorn/rails