Merge branch 'dev'

Add new parameters for graph API methods

Duplicate methods in arango.client.ArangoClient to arango.database.Da…

…tabase for non-root access

Merge branch 'master' of github.com:joowani/python-arango

Merge pull request arangodb#37 from joowani/develop

Add parameter replication_factor to method Database.create_collection

Add Database.get_document method to allow direct retrieval of documen…

…ts by ID

Force kill ArangoDB at the end of Travis CI builds

Merge pull request arangodb#26 from joowani/develop

Develop

Add arguments check_cert and use_session to ArangoClient

Change default host to 127.0.0.1 from localhost