Use hourly Arduino builds on Travis

Author: igrr

.travis.yml

@@ -4,7 +4,7 @@ os:
   - linux
 
 script:
-  - wget http://downloads.arduino.cc/arduino-1.6.5-linux64.tar.xz
+  - wget https://www.arduino.cc/download.php?f=/arduino-nightly-linux64.tar.xz
   - tar xf arduino-1.6.5-linux64.tar.xz
   - mv arduino-1.6.5 $HOME/arduino_ide
   - cd $HOME/arduino_ide/hardware