Pyarango

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* restoreIndex and restoreIndexes in collection will restore previously deleted indexes
* added max_conflict_retries to handle arango's 1200
* added single session so AikidoSessio.Holders can share a single request session
* added task deletion to tests reset
* added drop() to tasks to remove all tasks in one command
* better documentation of connection class
* False is not considered a Null value while validating
* Removed redundant document creation functions
* More explicit validation error with field name

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* Bugfix: Query iterator now returns all elements instead of a premature empty list
* Bugfix: Collection naming when using the arango's name argument
* New: Schema validation example
* New: Satellite graphs

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* SSL certificate support
* More doc
* Fixed on_load schema validation
* Gevent, monkey patching breaks python's multi=processing. Removed grequests as the default, back to requests.
* Removed grequests and gevent as hard dependencies. Added explicit error messages, to prompt users can install them if needed.
* Jwauth is not in its own file
* Generic rest call to database support (action) for connection, database.
* Foxx support
* Tasks create, delete, fetch support

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* Validation bug fixes
* New Numeric, Int, Bool, String, Enumeration, Range validators
* Fields can have default values
* When creating a new document, Collection will serve one populated with defaults
* stastd support thx to: dothebart
* properties definition in schema
* AQL errors now come with prints and line numbers for everyone's convenience
* Bulk save for Document objects and dicts

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* Will die gracefully if server response is empty
* getStore and getPatches shorthands added to Document

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* Fixed nested store patch update
* REFACT: New DocumentStore class for taking care of storing document in a hierarchy of stores (nested objects) and validate them
* Minor bug fixes