Introduce GPG operations

Add methods for cryptographic authentication of Cask packages with
the GPG software suite.

Homebrew Cask invokes the system-standard `gpg` binary to import
keys to the GPG keychain, download signatures to versioned metadata
folders, and verify packages. Homebrew Cask aborts if any step fails.

GPG verification is not currently invoked during the audit or
installation processes, and is intentionally left undocumented.

Example usage:
    gpg = Cask::GpgCheck.new(cask)
    gpg.verify(package_archive_path) if gpg.available
remove DSL-change banner
Add binary stanza to Julia cask
Update LastPass universal installer

LastPass now uses a .zip file with an installer app rather than
a .dmg with a .pkg installer.
PutIOSync for OS X

PutIOSync is a little menubar app for your Mac that allows you to
automatically download new files from put.io as they arrive in your
folders there. It can also delete successfully downloaded files from
put.io and flatten folder hierarchies, if you want it to.

https://github.com/arrizer/PutIOSync-OSX
Merge pull request #7703 from vitorgalvao/fix-7699

PutIOSync for OS X
Updated Deezer to 0.9.13_4123

Closes #7701.
lastpass-universal: rename to `lastpass`
Merge pull request #7704 from vitorgalvao/fix-7701

Updated Deezer to 0.9.13_4123
Merge pull request #7700 from yegortimoschenko/use-julia-binary

Add binary stanza to Julia cask
Merge pull request #7702 from jawshooah/update-lastpass-universal

Update LastPass universal installer
Merge pull request #7705 from claui/rename-lastpass

Rename `lastpass-universal` to `lastpass`
Add eclipse-cpp.
Merge pull request #7694 from weijianwen/eclipse-cpp

Add eclipse-cpp.
Upgrade Hive to v1.4.1
Upgrade Cloud Foundry CLI to 6.7.0
Merge pull request #7709 from cunnie/cloudfoundry-cli

Upgrade Cloud Foundry CLI to 6.7.0
Merge pull request #7708 from deizel/hive

Upgrade Hive to v1.4.1
Update vagrant-manager to v2.1.2

Update vagrant-manager to v2.1.2

Upgrade vagrant-manager to version 2.1.2. Latest version release 9th November 2014
Add zap stanza for doubleTwist