Pyarango

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* Some more meaningful error messages

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* Cross python support for iterators

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* Cross python support for metclasses

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* Support for python 3, does not support python 2.7 yet.
* Test root password and username can be defined in environement variables.

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* Support for ArangoDB 3.X, pyArango no longer supports 2.X versions
* Support for authentication
* User support added
* Added AikidoSession to seemlessly manage request sessions
* AikidoSession stores basic stats about the requests
* AikidoSession detects 401 errors and notifies the user that authentication is required
* AikidoSession detects connection errors and notifies the user that arango is probably not running
* save() and patch() functions now empty _patchStore is succesfull
* Added free key word arguments for the creation of AQL Queries