Dyn

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- Fixed the majority of warnings when building docs, per issue 18
- Added `dyn.tm.zones.get_all_secondary_zones` function for retrieving all secondary zones for an account

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- Fixed an issue where attempting to access a Zone's serial resulted in always performing a GET call

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- Adding additional hooks to dyn.tm.errors that return collections of exceptions

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- dyn.tm.session.DynectSession now accepts a `history` flag to enable per-session history recording

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- Addition of dyn.tm.tools module
- Added change_ip and map_ip functions to dyn.tm.tools
- Added __enter__ and __exit__ methods to DynectSession for allow for use as a context manager
- Added dyn.core.SessionEngine.new_session classmethod for forcing new session generation

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- Internally improved Python2/3 compaability with the intoduction of the dyn.compat module
- Timestamps for various report types are accepted as Python datetime.datetime instances
- Added qps report access to Zones
- Added __str__, __repr__, __unicode__, and __bytes__ methods to all API object types
- Added conditional password encryption to allow for better in-app security
- Added the ability for users to specify their own password encryption keys
- Added __getstate__ and __setstate__ methods to SessionEngine, allowing sessions to be serialized
- Misc bug fixes