Added a section about the requirements to the documentation.

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+Requirements
+============
+
+The complete list of required Python modules is in the file
+``requirements.txt``.
+
+The core technologies used are:
+
+* `Flask <http://flask.pocoo.org>`_ for the web backend;
+* `asyncio <https://www.python.org/dev/peps/pep-3156/>`_ for the crawler;
+* `SQLAlchemy <http://www.sqlalchemy.org>`_ for the data base.
+
+Python 3.4 is highly recommended, especially for the feed crawler.
+The web server is working with Python 2.7 and Python 3.
+
+It is possible to connect your own crawler to the RESTful API.