Scaper

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- Fixes a bug with fade in and out lengths are set to 0.
- This is the last version to support Python 2.7 and 3.4.

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- Scaper now returns the generated audio and annotations directly in memory, allowing you to skip any/all file I/O!
- Saving the audio and annotations to disk is still supported, but is now optional.
- While this update modifies the API of several functions, it should still be backwards compatible.

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- Operations on all files happen in-memory now, via new PySox features (build_array) and numpy operations for applying fades.
- Scaper is faster now due to the in-memory changes.

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- Fixed a bug where trim before generating soundscapes from a JAMS file with saving of isolated events resulted in incorrect soundscape audio.

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- Fixed a bug where _sample_trunc_norm returned an array in Scipy 1.5.1, but returns a scalar in Scipy 1.4.0.

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- Fixed a bug where time stretched events could have a negative start time if they were longer than the soundscape duration.