osx(package) Build without --asar
osx(package) Build without --asar

This change fixes the following issues:

- https://github.com/resin-io/herostratus/issues/17
- https://github.com/resin-io/herostratus/issues/18

cedricve/etcher,resin-io/etcher,fedealconada/resin-etcher,cedricve/etcher,resin-io/etcher,resin-io/herostratus,resin-io/herostratus,cedricve/etcher,resin-io/resin-etcher,resin-io/resin-etcher,resin-io/etcher,resin-io/etcher,fedealconada/resin-etcher,resin-io/etcher