Extract and apply fixes / cleanup from hierarchical branch.

[amcgregor]

Extract and apply fixes / cleanup from hierarchical branch.

[amcgregor]

• 9cc4ec0 Package build tweaks.
• 28598e4 Simplification of __ne__.
• c33bc34 Packaging tweaks, build parallelization, removal of egg legacy. (Subsequent removal of parallelism: fbf5a55 → 0ed0496)
• c79cd23 Array dead import removal.
• a30b5ef tzlocal version pinning for timezone support.
• 95a9758 Adapt to future reserved word use; use wait, not await.
• 0733071 Bandit exclusions.
• bd1a09a → f71fdf1 Correction for filtering with cast None values and minor CPython field reference optimization.
• 741e978 → 06f6b0c Logical order correction accounting for Date changes. (TTL)
• eed25b4 → 57e3e7f Utilize pytz.utc if available.
• 49ebe19 → 80ea953 Regexen silliness.
• c9da243 → c0cb7d2 Addition of timezone handling to Date fields.
• 10c3435 → 9e5b4bf Test on multiple MongoDB versions, with and without timezone support. (And related dffe131 → c6385e7.)
• 7114499 → afc72c4 Simplification of testing requirement declaration, fix for comparison on Travis. (and bbaa06d → a39eb36)
• 00590d0 → 58850d1 Armour against missing optional modules.
• da9f07d → c30c786 Additional venv ignores.
• 5880531 → 0d04635 Added docs submodule and tweaked Landscape.io config.

[amcgregor]

Tests pass, coverage may need work.

[amcgregor]

General extraction complete, miscellaneous tests in and code cleanup (such as dead code removal) completed; all that remains is #51.