Arduino changed the download link again

This time it uses a script, curl handles it ok luckily.

The "old" link was: http://downloads.arduino.cc/arduino-1.0.6-linux64.tgz

But now that returns a 404, and you have to go via the script:

http://arduino.cc/download.php?f=/arduino-1.0.6-linux64.tgz

Which then generates a unique URL and uses a 302 redirect to something like:

http://downloads.arduino.cc/arduino-1.0.6-linux64.tgz?AWSAccessKeyId=hKqOiStmqc_Y3-9k2xue&Expires=1415414377&Signature=Z64EWZiAnm7dMBY4gj2XGE2WKtk%3D

Annoyingly all PR's will fail the tests until this one is merged.