Nipyapi

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* Refactored many functions to use native NiFi datatypes instead of generics
* Standardised several call names for consistency
* Updated examples
* Created additional tests and enhanced existing to capture several exceptions

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* Added template import/export with working xml parsing and tests
* Added a ton of testing and validation steps
* Cleared many todos out of code by either implementing or moving to todo doc

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* migrated swagger_client to separate repo to allow independent versions
* refactored wrapper Classes to simpler functions instead
* cleaned up documentation and project administrivia to support the split

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* Added wrapper functions for many common Template commands (templates.py)
* Added new functions for common Process Groups commands (canvas.py)
* Significant test framework enhancements for wrapper functions
* Many coding style cleanups in preparation for filling out test suite
* Added linting
* Cleaned up docs layout and placement within project
* Integrated with TravisCI
* Dropped Python2.6 testing (wasn't listed as supported anyway)
* Updated examples and Readme to be more informative

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* Fixed bug where tox failing locally due to coveralls expecting travis
* Fixed bug where TravisCI failing due to incorrectly set install requirements
* Fixed bug where swagger_client not importing as expected

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* Fixed imports and requirements for wheel install from PyPi