Fix bug in StringBuilder.insert()
Fix bug in StringBuilder.insert()

dicej/avian,joshuawarner32/avian,lostdj/avian,MaartenR/avian,bgould/avian,MaartenR/avian,lostdj/avian,lostdj/avian,bigfatbrowncat/avian-pack.avian,ucdseniordesign/avian,badlogic/avian,bigfatbrowncat/avian-pack.avian,lwahlmeier/avian,ucdseniordesign/avian,MaartenR/avian,MaartenR/avian,marcinolawski/avian,lwahlmeier/avian,getlantern/avian,bgould/avian,dicej/avian,lwahlmeier/avian,dicej/avian,getlantern/avian,minor-jason/avian,badlogic/avian,minor-jason/avian,marcinolawski/avian,getlantern/avian,bgould/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,dicej/avian,getlantern/avian,ucdseniordesign/avian,ucdseniordesign/avian,badlogic/avian,joshuawarner32/avian,badlogic/avian,minor-jason/avian,marcinolawski/avian,bigfatbrowncat/avian-pack.avian,minor-jason/avian,bgould/avian,joshuawarner32/avian,lwahlmeier/avian,marcinolawski/avian,lostdj/avian