chore: fix minor install script problems (#777)
chore: fix minor install script problems (#777)

When running the install script as root (e.g. inside a Docker container), bower complained that it

"shouldn't" be run with sudo. When running the x86 install multiple times, it tried to move

Etcher-linux-ia32 inside the existing Etcher-linux-x86/ folder, rather than renaming it, which meant

later commands failed.
resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/etcher,resin-io/resin-etcher,resin-io/resin-etcher,resin-io/etcher,resin-io/herostratus,resin-io/herostratus