Change Arduino Beta cask to Arduino Nightly

Arduino has moved away from Beta versions, and is not doing nightly (hourly) builds.

Casks/arduino-beta.rb

@@ -1,29 +0,0 @@
-cask :v1 => 'arduino-beta' do
-  version '1.6.1'
-
-  if MacOS.release <= :snow_leopard
-    depends_on :java => '6'
-
-    sha256 'c84734a1d5b76641e12484be7a1a99c006173d939c730fd04085faa02323e7af'
-    url "http://arduino.cc/download.php?f=/arduino-#{version}-macosx.zip"
-  else
-    depends_on :java => '7'
-
-    sha256 'c71cad988acf8923cd190d778b469b4ebbdab3f3776fa80237b25bd7af3b7ccb'
-    url "http://downloads.arduino.cc/arduino-#{version}-macosx-java-latest.zip"
-
-    caveats <<-EOS.undent
-      Version #{version} for Java 7+ is experimental (see http://arduino.cc/en/Main/Software).
-      If you experience problems running it please download the Java 6 version
-
-        http://arduino.cc/download.php?f=/arduino-#{version}-macosx.zip
-
-      and install it manually.
-    EOS
-  end
-
-  homepage 'http://arduino.cc/'
-  license :oss
-
-  app 'Arduino.app'
-end

Casks/arduino-nightly.rb

@@ -0,0 +1,11 @@
+cask :v1 => 'arduino-nightly' do
+  version :latest
+  sha256 :no_check
+
+  url 'http://downloads.arduino.cc/arduino-nightly-macosx.zip'
+  name 'Arduino'
+  homepage 'https://www.arduino.cc/'
+  license :oss
+
+  app 'Arduino.app'
+end