global: kwalitee fixes in invenio.testsuite

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
base: eval is evil

* Using ast.literal_value instead of eval to parse user provided values.
  Safer and more reliable (bool("False") -> True)

* Removing the checks that the new type corresponds with the known type
  for the value.

* Adding some tests to invenio.base.

* Adding invenio.base to the list of packages to collect test suites
  from.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
base: footer modularity improved

* Removing styles on the <footer>. It's a generic element that may be
  used at more than one place, like <p> or <address>.
  http://www.whatwg.org/specs/web-apps/current-work/#the-footer-element

* Adding blocks in the footer template so one can reuse the content
  without having to keep the outter structure.

* Removing inline style.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>