Add backstretch to JS lib
Add backstretch to JS lib

jinutm/silveralms.com,rockkhuya/taydantay,jinutm/silvfinal,jinutm/silverclass,raksonibs/raimcrowd,jinutm/silverprod,jinutm/silverpro,rockkhuya/taydantay,raksonibs/raimcrowd,jinutm/silverpro,MicroPasts/micropasts-crowdfunding,jinutm/silveralms.com,gustavoguichard/neighborly,jinutm/silverme,raksonibs/raimcrowd,gustavoguichard/neighborly,MicroPasts/micropasts-crowdfunding,gustavoguichard/neighborly,jinutm/silverclass,jinutm/silverme,jinutm/silverclass,MicroPasts/micropasts-crowdfunding,jinutm/silveralms.com,jinutm/silvfinal,MicroPasts/micropasts-crowdfunding,rockkhuya/taydantay,jinutm/silverprod,jinutm/silverpro,raksonibs/raimcrowd,jinutm/silverprod,jinutm/silvfinal,jinutm/silverme