Added ARM prebuilt binaries for Leveldown
Added ARM prebuilt binaries for Leveldown

- this is necessary because leveldown does not supply an ARM binary
- butcher needs a binary so that compiler tool chains are not necessary
snogcel/bitcore-node-dash,braydonf/bitcore-node,braydonf/bitcore-node,zcoinrocks/bitcore-node,snogcel/bitcore-node-dash,zcoinrocks/bitcore-node,kleetus/bitcore-node,kleetus/bitcore-node