Refactor codebase to modern (Airbnb) standards

Refactor codebase

Refactor codebase to modern (Airbnb) standards (project source code is nearly two years old)

Support Vim (ignore *.swp files)
Specify Node engine ^12.22.3
- Older versions may work but provide little benefit
- Version 14 takes a long time to compile Nodegit
- Version 16 throws Nodegit compile errors
Add Airbnb to eslint
- Add new packages
  - eslint-config-airbnb-base
  - eslint-plugin-import
Update packages
- bluebird from ^2.1.3 to ^3.7.2
- commander from ^2.2.0 to ^8.0.0
- lodash from ^2.4.1 to ^4.17.21
- nodegit from ^0.26.2 to ^0.27.0
- eslint from ^1.5.1 to ^7.30.0
- mocha from ^2.3.3 to ^9.0.2
- releasor from ^0.1.3 to ^1.2.1
Remove packages
- Remove jscs (is now in eslint)
Fix 504 eslint errors
- 1 brace-style
- 1 no-else-return
- 1 no-plusplus
- 1 no-redeclare
- 1 object-shorthand
- 1 padded-blocks
- 1 prefer-destructuring
- 2 block-scoped-var
- 2 no-extra-parens
- 2 space-after-keywords
- 2 space-return-throw-case
- 3 no-undef
- 4 eqeqeq
- 5 semi
- 9 prefer-template
- 10 operator-linebreak
- 15 comma-dangle
- 20 vars-on-top
- 37 func-names
- 37 prefer-arrow-callback
- 37 space-before-function-paren
- 42 no-var
- 345 indent
Bump revision from ^1.4.0 to ^1.4.1