Update sysutils/capistrano to 2.12.0

Upstream changes:
-----------------

## 2.12.0 / April 13 2012

This release revserts the very verbose logging introduced in the previous
version, it also enables a handful of power-user features which are largely
un-documented, but shouldn't be important unless you are looking for them.
Undocumented code shouldn't scare you, simply read through deploy.rb in the Gem
if you want to know how a new feature works!

 * Update mapped commands to remove symlink deprecation warning. Despo Pentara
(despo)

 * Add the "rpm" remote dependency. Nick Hoffman (nickhoffman)

 * Add commented deploy:cleanup task to default recipe. Jean-Philippe Doyle
(j15e)

 * Teach deploy:web:enable to fail gracefully. Lee Marlow (lmarlow)

 * Ticket 193 alias task show wrong name when it is not overridden. Rafa García
(rgo)

 * Allow configuration of which roles assets are precompiled on. Frederick
Cheung (fcheung)

 * Fix transfer action to honor dry-run flag. Serg Podtynnyi (shtirlic)

 * Changed single to double quotes for Windows, fixes a Windows bug in the HG
module. Matthew J Morrison (mattjmorrison)

 * Add UnsharedRemoteCache (copied from eycap gem). Ben Symonds (bensymonds)

As ever, a sincere thanks to all contributors, and do not hesitate to contact
me if this release causes problems for you.

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