installation: location of parsley.js

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

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
installation: location of sly.min.js

* Updates location of sly.min.js to use invenio-software.org hosting.

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
installation: location of jquery.blockUI.js

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

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
installation: location of jquery.omniwindow.js

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

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