meshlab: bugfixes and version bump

Squashed commit of the following:

commit 8e83a4b4baa6fbbcfd17f2d86fb5467fde17aa4a
Author: Ingmar Steiner <[email protected]>
Date:   Mon Feb 16 16:45:22 2015 +0100

    meshlab: fix the case fix

    ca0fedac445140453faac5e29d52e2c76fe19215 fixed the meshlab.app for case-sensitive filesystems, but *broke* it on case-insensitive ones! This commit causes that fix to be applied only when necessary, i.e., on case-sensitive filesystems, and leaves the app alone otherwise.

commit e0658e95008db4efdc07133ae13821a9ef64c99f
Author: Ingmar Steiner <[email protected]>
Date:   Mon Feb 16 15:22:42 2015 +0100

    meshlab: update to v1.3.3

commit 32f1cee686c0c67e5335fd3a0a74dfef21639cb0
Author: Ingmar Steiner <[email protected]>
Date:   Mon Feb 16 15:20:03 2015 +0100

    meshlab: fix hard-coded version string in URL

commit ca0fedac445140453faac5e29d52e2c76fe19215
Author: Ingmar Steiner <[email protected]>
Date:   Mon Feb 16 15:14:23 2015 +0100

    meshlab: fix broken app on case-sensitive file systems

    workaround is to create a symlink with the case required by the `Info.plist`:

        MeshLab -> meshlab

Casks/meshlab.rb

@@ -1,10 +1,16 @@
 cask :v1 => 'meshlab' do
-  version '1.3.2'
-  sha256 '4ea9f5d99bf1c55c870fe75919397e6788e441e0dcd564311089eb63f93ec989'
+  version '1.3.3'
+  sha256 '7a19583ecd8282e9dc84e827e9e667f2139edd371b5f83a5c3fcbb88cb33923d'
 
-  url "http://downloads.sourceforge.net/project/meshlab/meshlab/MeshLab%20v#{version}/MeshLabMac_v132.dmg"
+  url "http://downloads.sourceforge.net/project/meshlab/meshlab/MeshLab%20v#{version}/MeshLabMac_v#{version.gsub('.','')}.dmg"
   homepage 'http://meshlab.sourceforge.net/'
   license :gpl
 
   app 'meshlab.app'
+  postflight do
+    # workaround for bug which breaks the app on case-sensitive filesystems
+    Dir.chdir("#{staged_path}/meshlab.app/Contents/MacOS") do
+      File.symlink("meshlab", "MeshLab") unless File.exists? "MeshLab"
+    end
+  end
 end