Pya

* Bugfix 34: Improve indexing of Asig
* Added developer tools for documentation generation
* Improved string handling to prevent Python 3.8 warnings
* Fixed reverse proxy resolution in JupyterBackend for Binder hosts other than Binderhub
* Fixed travis job configuration

* Fixed bug of multi channel fade_in fade_out
* Introduced timeslice in extend setitem mode as long as stop reaches the end of the array.
* Added Sphinx documentation which can be found at https://interactive-sonification.github.io/pya
* Introduced new Arecorder method to individualize channel selection and gain adjustment to each channel
* Added Binder links to Readme
* Introduced Jupyter backend based on WebAudio
* Updated example notebook to use WebAudio when used with Binder
* Switched test framework from nosetests to pytest

* Remove ffmpeg from requirement, and it has to be installed via conda or manually
* Decouple pyaudio from Aserver and Arecorder
* Introduce backends interface: PyAudio(), Dummy()
* add device_info() helper function which prints audio device information in a tabular form
* Bugfix 23: Add a small delay to server booting to prevent issues when Aserver and Arecorder are initialized back-to-back
* Helper function `record` has been dropped due to legacy reasons. An improved version will be introduced in 0.3.2.

* Restructure Asig, Astft, Aspec into different files
* Add Arecorder class
* Several bug fixes
* Made ffmpeg optional
* Introduced CI testing with travis (*nix) and appveyor (Windows)
* Introduced coveralls test coverage analysis

* 0.2.1 is a minor update that removes the audioread dependency and directly opt for standard library for .wav and .aif support, ffmpeg for .mp3 support.
* Bugfix for multichannels audio file loading resulting transposed columns and rows.

* First official PyPI release