Update install script so it doesn't need to be run with sudo.

[jeichorn]

We only need sudo for installing the wrapper. In install.sh check if we need permissions and make the copy call with sudo if needed (make sure to message what we doing before calling sudo since it might prompt a login.

[mlteal]

ran install.sh without sudo (freshly pulled) and still getting cp: /usr/local/bin/northstack: Permission denied (ran with sudo after and it was happy)

[mm-pagely]

@mlteal Can you run the install script with bash in debug mode and with the DEBUG env var set and give us the output?

$ DEBUG=1 bash -x ./bin/install.sh

[mlteal]

Fixed now!

[mm-pagely]

ae97752874bba1c9ba8557fc1842f5a0356199c7 FTW