Add ImageOptim cask

[ImageOptim][] is an open [source][] GUI for lossless image compression.

[ImageOptim]: http://imageoptim.com
[source]: https://github.com/pornel/ImageOptim
Add cask for Air Video Server
Merge pull request #223 from mwarkentin/air-video-server

Add cask for Air Video Server
updated macvim to 7.3-66
Merge pull request #224 from brandt/imageoptim

Add ImageOptim cask
Added ImageAlpha
Added avidemux cask
Cask for Chicken VNC client

Added Chicken (formally Chicken of the VNC) client to cask.
Not much more detail. Tested locally.
Add cask for CoRD
Add Cask for Fantastical
Use a specific version of Fantastical
Merge pull request #227 from tangphillip/fantastical

Add Cask for Fantastical
Correcting sourceforge download url
Fixing chicken sf link and version

The version number was off, corrected download link, version,
and sha.
Fixing sf download links

Chromium, free-cad, mumble, open-office, seashore, and unetbootin
were all using url's that ended in download rather than the
filename. This has been changed, sha's are preserved.

Mumble does not have a 'latest' download alias in the new url
scheme. It does however specifiy a version so the Cask was updated
to reflect this.

Closes #229

Signed-off-by: phinze <paul.t.hinze@gmail.com>
added newline at the end of file
Merge pull request #225 from savagegus/chicken

Cask for Chicken VNC client
Fixing sf link for CoRD
Merge pull request #226 from savagegus/cord

Add cask for CoRD
add link param to spotify

prevents linking "Relauncher.app"