WebMessage: fix for failing regression test

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
installation: empty Travis configuration

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
dbquery: fix regression test cases

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
WebSearch: fix demo site fixtures

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>
WebSearch: disable webcoll part two

* Webpage collection cache update is not really needed in Invenio-on-Flask,
  so switch it off and gain great webcoll speed improvement.

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