installation: location of jquery.blockUI.js
installation: location of jquery.blockUI.js

* Updates location of jquery.blockUI.js to use invenio-software.org hosting.

Signed-off-by: Tibor Simko <c7116e45300b163846dc01f3ed02116e3f8ef7a5@cern.ch>

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