installation: latest base packages

• BETTER Amends installation scripts and documentation to use the recently released Invenio-Base package where manage.py was replaced by setup.py. (closes #3572)

• Updates several other Invenio dependencies such as Invenio-Access, Invenio-Records, Invenio-Records-UI, Invenio-Theme.

• Runs Celery in eager mode until separate worker node is set up.

• Amends README file to mention PostgreSQL and SQLite alongsite MySQL in the list of supported databases, as well as Elasticsearch for information retrieval and Redis for caching.

• Amends development server to listen on all IP addresses.

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