Updated install docs + Continuously integrated sources

[Uche Ogbuji]

After some discussion with David Feeney, my colleague at Zepheira I've updated Amara/Akara install docs across the board to use virtualenv. This simplifies things a great deal, overall. Of course anyone can feel free to install without virtualenv, if they like, but we might not be able to provide as much guidance.

These updated instructions also introduce a new resource. At Zepheira we have created a PyPI mirror <http://pypi.zepheira.com/releases/index> connected to a Jenkins instance to host continuously-integrated versions of some of our open-source projects, including Amara and Akara. This replaces the old, unreliable nightly snapshots regime.

 * http://www.xml3k.org/Amara/Install

 * http://www.xml3k.org/Akara/Install

 * http://www.xml3k.org/Akara/Install/Mac

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Uche Ogbuji                       http://uche.ogbuji.net
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