new formula: skim app (pdf viewer and note taker)

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/skim.rb

@@ -0,0 +1,20 @@
+require 'formula'
+
+class Skim <Formula
+  head 'http://skim-app.svn.sourceforge.net/svnroot/skim-app/trunk'
+  homepage 'http://skim-app.sourceforge.net/'
+
+  def install
+    system "xcodebuild"
+    prefix.install "build/Release/Skim.app"
+  end
+
+   def caveats; <<-EOS
+      Skim.app was installed in:
+        #{prefix}
+
+      To symlink into ~/Applications, you can do:
+        brew linkapps
+    EOS
+  end
+end