OOBE install fails if curl is not installed

[sandeepmistry]

I was trying the OOBE getting started flow with entering the IP address of a fresh Ubuntu 16.04 VM.

It was failing because curl is not installed by default. @mastrolinux suggested using wget instead which is installed by default on Ubuntu.

After manually installing curl via apt the getting started flow succeeded.

[sandeepmistry]

Closed via https://github.com/arduino/webide/commit/44efa2fc4a65026680aa93465161b2b7ed57e34f and https://github.com/arduino/webide/commit/bd38213f74a1b3c71e121a8b48470864d283dcbd.