Dropped requirement of having to use PHP.  Removed the configuration philosophy section that became somewhat anachronic now; integrated its interesting parts into the main explanatory text.
Dropped requirement of having to use PHP.  Removed the configuration
philosophy section that became somewhat anachronic now; integrated its
interesting parts into the main explanatory text.

inveniosoftware/invenio,tiborsimko/invenio,inveniosoftware/invenio,tiborsimko/invenio