Neomodel-next

* Upgrade neo4j-driver to 1.2.1 251

* Return StructuredRel instance as opposed to None when no model supplied 248
* Fix get_or_create docs and incorrect call to rel_helper 249

* Add get_or_none to RelationshipManager 246
* Make sure relationship types are escaped in queries 188
* Fix bug causing unsaved node not to appear in deflate error msg
* Allow typed arrays in ArrayProperty 237
* Add save hooks to StructuredRel 242
* Add tests for UniqueIdProperty when used in batch or merge.
* Update documentation for batch operations
* Add all_relationships() method to RelationshipManager 239

* Dont install test directory 238

* Upgrade neo4j_driver to 1.1.0
* Fix install_labels on an abstract node
* Clean up hooks code, django_neomodel.DjangoNode required for signals
* Add order_by method to relationships
* Add config.ENCRYPTED_CONNECTION - adrianicv
* Add config.MAX_POOL_SIZE
* Add neomodel_install_labels command
* Turn off AUTO_INSTALL_LABEL by default

* Improve docs
* Add change_neo4j_password
* Add clear_neo4j_database
* Add UniqueIdProperty for easy ids
* remove NEOMODEL_FORCE_TIMEZONE environment var now a config option
* Move django signal support to neomodel
* Add stdout input to install_labels etc