Fix warning on admin training docs

* Fix table format on model.rst
* Fix some unexpected code block close.
* Fix unfinished underscored title on introduction.rst
* Fix links on csv training doc
* Include complete example on crop_agro page
various fixes to admin and arch parts
Merge branch 'issue_37_fix_warnings' of git://github.com/alediator/crop-information-portal into alediator-issue_37_fix_warnings
Merge branch 'master' of github.com:geosolutions-it/crop-information-portal