Added Adobe Lightroom 4.4

Added Adobe Lightroom 4.4 cask, Version 3 is already available here.

```
$ brew cask install lightroom4
==> Downloading http://download.adobe.com/pub/adobe/lightroom/mac/4.x/Lightroom_4_LS11_mac_4_4.dmg
######################################################################## 100.0%
==> Running installer for lightroom4; your password may be necessary.
Password:
==> installer: Package name is Adobe Photoshop Lightroom 4.4
==> installer: Installing at base path /
==> installer: The install was successful.
🍺  lightroom4 installed to '/opt/homebrew-cask/Caskroom/lightroom4/4.4' (6 files, 429M)
````

```Shell
$ brew cask audit lightroom4 --download
==> Downloading http://download.adobe.com/pub/adobe/lightroom/mac/4.x/Lightroom_4_LS11_mac_4_4.dmg
Already downloaded: /Library/Caches/Homebrew/lightroom4-4.4.dmg
audit for lightroom4: passed
```