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Neo4j migration (#162)

First stage of consolidating calls to Neo4j.

NB you’ll need to set the neo4j port that you use in phenopolis/local.cfg NEO4J_PORT.

Authentication and change_password now use the Neo4j Python Driver (pypackage neo4j-driver) as recommended by Neo4j (#159) and removed py2neo. A global neo4j_driver is set up and
with neo4j_driver.session() as neo4j_session: is used, as per 13th July discussion, #159.

Neo4j uri and password is set in phenopolis/local.cfg.

Tests have been updated to load a test user and demo user in to a Neo4j database. 

Reinstated display of phenopolis version number in the ‘about’ page. If no tagged version number is available, it displays the time of the last commit.

* Working on migrating to Neo4j Python Driver in views/__init__.py. Added test on users db.

* Add test data.

* Added test on Users in Neo4j.

* Corrected test on neo4j user data by checking for empty result.

* Changed check_auth function to use Neo4j-driver instead of py2neo.

* Migrated change_password to use Neo4j-driver and added a test.

* Refactored to use neo4j_driver from views module in the tests too. Removed test_login because it is now tested in test_neo4j. Added demo user to neo4j at start of test_gene.

* Reinstated the version number on the 'about' page. It is a tag version number if available or the last commit date if not.

* Removed py2neo because it is no longer used.

* Corrected config setting.

* Testing neo4j on a different port.

* Set neo4j port back to 7687, as required by Travis.

* Testing neo4j on a different port.

* Set neo4j port back to 7687, as required by Travis.

* Get neo4j settings from app.config instead of direct from config file.

* Add neo4j to easy_install.

* Add note on setting Neo4j details in easy_install.

* Corrected links in README.md. Renamed test_neo4j to test_login.

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