Update dependencies, set things up for my workflow

[chessai]

This PR accomplishes several things:

• removes dist-newstyle (local build artifacts should not be checked in)
• extends the .gitignore to include many common build artifacts/editor artifacts
• allow more modern dependencies (upper bounds of many were out of date by one or two years' worth of releases)
• upgrade stack lts (9.2 -> 14.2) to GHC 8.6.5
• regenerate .travis.yml using the now-standard haskell-ci (many haskell core libraries use this), instead of the outdated script that was maintained by hvr; as a precursor to this, the tested-with versions were updated
• add nix to accomodate my typical workflow/assist anyone used to a nix-based workflow (this does not interefere with already existing stack-based workflow)
• add Makefile to accommodate my make-based workflow

[chessai]

Interestingly, it looks like the test suite fails on GHC-8.8.3 but not 8.6.5 or 8.4.4:

      KA Tests
        Corpus Tests:              FAIL
          tests/Duckling/Testing/Asserts.hs:92:
          2 tokens found for "ოცი დოლარი და ორმოცდასამი ცენტი"

      KA Tests
        Corpus Tests:              FAIL
          tests/Duckling/Testing/Asserts.hs:91:
          empty result on "ოცდაერთი"

      KA Tests
        Corpus Tests:              FAIL (0.07s)
          tests/Duckling/Testing/Asserts.hs:92:
          2 tokens found for "ხუთშაბათს 10-ის ნახევრიდან 11:00-მდე"

[chessai]

The test failure on a newer compiler is out of scope for this PR. I will open up a separate issue. For now I will change the .travis.yml to only care about GHC 8.4.4 and 8.6.5

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[chessai]

Closing - will make necessary changes in a separate PR