Update .gitignore and add parameters to Database.create_collection

Update setup.py, MANIFEST.in and docs/conf.py

Revamp the library for 4.0.0.

Add license information in setup.py

Add logger parameter and update documentation on customer HTTP clients

Update documentation on thread-safety and add API for pregel

Fix a bug in BaseCollection.properties method

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