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I made some wording changes and improved the formatting of the README.
Also included is suggesting to install this package as a Composer dev package. Your original README suggested installing this for the Symfony2 dev environment already, so we should follow that with Composer.
Most developers will not need to use phpdoc while in production, so they will only use it while on their local or test/build machine. This way the bundle and phpdocumentor itself will not need to be installed anywhere else.