Update iterm2 version to 20131228
Merge pull request #67 from linc01n/iterm2-beta

Update iterm2-beta version to 20131228
Update KeePassX version to 2.0.0-alpha5.
Merge pull request #68 from goxberry/keepassx2-2.0a5

Update KeePassX version to 2.0.0-alpha5.
Add a basic CONTRIBUTING file.

Add a CONTRIBUTING file containing only the changes necessary for
contributing to this project, referring to the homebrew-cask project
for material common to both projects.
Merge pull request #69 from goxberry/add-contributing-file

Add a basic CONTRIBUTING file.