Iperf3

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- Added UDP support (thanks to fciaccia)
- Added bandwidth parameter
- json_output = False will now print testresults to screen

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- Improved zerocopy setter validation
- Fix for incorrect return of reverse flag (thanks to fciaccia)

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- Added reverse test parameter (thanks to cvicente)
- Updated travis build to test against iperf3 versions 3.0.6 through 3.1.3

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**main functionality available**

- introduced TestResult class providing easy access into test results
- updated client and server examples
- minor documentation tweaks

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**Initial Release**

- Client and Server classes around iperf3's libiperf.so.0 API
- Documentation on readthedocs
- py.tests
- blood
- sweat
- a lot of tears