collect: addition of filter for Blueprints

* Upgrades to Flask-Collect>=1.1.1. (closes #2353)

* Adds DeprecationWarning to Invenio link storage.

* Updates .travis.yml.

* Updates documentation.

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
installation: SQLAlchemy, SQLAlchemy-Utils upgrade

* Updates minimum and maximum version requirements for
  SQLAlchemy and SQLAlchemy-Utils.  (closes #1776)

* Fixes compatibility problems with SQLAlchemy>=0.9 version.

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
installation: addition of OS X installation guide

* Addition of a section on how to install invenio software
  on OS X 10.9 or later.  (PR #2392)

Co-authored-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Konstantinos Kostis <konstantinos.kostis@cern.ch>