Update XLD to 20140427

Version format adapted to what XLD uses in both GUI and websites. (YYYY-MM-DD -> YYYYMMDD)

In XLD's "About" dialog, a more common X.Y version (as of this release, 146.0) is also included.
I would favor the YYYYMMDD format, as:
- it is what appears in websites and distribution channels;
- subsequently, it does not require the cask maintainer to manually verify it through the GUI.

Note: while the binary can also be downloaded from the developer's website, low bandwidth suggests that it is not intended as primary distribution channel.