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add bindata.go to git

  * no go-bindata dependency when building this
    project after checkout
  * bindata.go are automatic re-generated per git hook:

main:~> cat ~gosrc/zfs-snap-diff/.git/hooks/pre-commit

if ! git diff --quiet --cached webapp; then
  echo "webapp content changed - trigger gen-bindata.sh"
  sh ./gen-bindata.sh

  # add re-generated bindata.go to index
  git add bindata.go
fi