GitLab

* Update requirements and travis installation

* Drop support for 3.5 and add test for 3.8

Python 2.7 was EOL on January 1, 2020

The last torchaudio release to support Python 2.7 was 0.4.0
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>

* Revert "CI Fix: Remove Python 3.7 (#232)"

This reverts commit 7b54714d.

* apply feedback

- Apply __future__ imports uniformly (future division is the biggy, but absolute
  imports mattered too)
- Hotfix use of tempfile.TemporaryDirectory using a BC library (DO NOT
  add this library as a dependency to torchaudio; it's only for testing)
- Replace math.gcd with fractions.gcd
- Fix a weird pytest collection bug involving parametrized tests
- Turn on Python 2 and Python 3.7 in Travis.
Signed-off-by: Edward Z. Yang <ezyang@fb.com>