pocketsphinx - initial commit

Commit of the ros-package ``pocketsphinx`` (http://wiki.ros.org/pocketsphinx) which is a wrapper for ``pocketsphinx``.

Note that the ros package is named the same as the original package it is a wrapper for - this causes problems for meta-ros, as we do not have a dedicated ros path.
For that reason, I renamed the ros package to ``ros-pocketsphinx``.