[Breaking Change] Split off Shell into separate bundle

[humphd]

This is part of the work to reduce the size of Filer (see #575), and fixes #290. Our Shell is pretty big, and not always needed. This splits it out into a separate bundle, and if you want it, you include it. Here's the breakdown of our build now:

$ npm run build

> filer@0.0.44 build-filer /Users/humphd/repos/filer/package.json
> parcel build --global Filer src/index.js --out-file filer.min.js --detailed-report

✨  Built in 432ms.

dist/filer.map    347.85 KB    76ms
dist/filer.js     192.61 KB    91ms
✨  Built in 237ms.

dist/filer.min.map                                  288.99 KB    56ms

dist/filer.min.js                                    74.06 KB    65ms
├── src/filesystem/implementation.js                 21.46 KB    21ms
├── node_modules/buffer/index.js                     19.54 KB    17ms
├── src/filesystem/interface.js                       3.84 KB    16ms
├── lib/intercom.js                                   3.76 KB     9ms
├── src/providers/websql.js                            2.5 KB    18ms
├── src/providers/indexeddb.js                        2.21 KB    17ms
├── node_modules/path-browserify/index.js              2.1 KB    23ms
├── node_modules/es6-promisify/dist/promisify.js       1.8 KB    21ms
├── src/node.js                                        1.7 KB     6ms
├── node_modules/process/browser.js                   1.69 KB    23ms
└── + 19 more assets

> filer@0.0.44 build-shell /Users/humphd/repos/filer/package.json
> parcel build --global Shell src/shell/index.js --out-file shell.min.js --detailed-report

✨  Built in 182ms.

dist/shell.map    107.9 KB    34ms
dist/shell.js     72.74 KB    33ms
✨  Built in 175ms.

dist/shell.min.map                                  100.17 KB    30ms

dist/shell.min.js                                    24.01 KB    30ms
├── node_modules/minimatch/minimatch.js               7.32 KB     9ms
├── src/shell/index.js                                3.88 KB     5ms
├── node_modules/path-browserify/index.js              2.1 KB     7ms
├── node_modules/brace-expansion/index.js             2.07 KB     5ms
├── node_modules/es6-promisify/dist/promisify.js       1.8 KB    10ms
├── node_modules/process/browser.js                   1.69 KB     8ms
├── src/constants.js                                  1.65 KB     3ms
├── src/errors.js                                     1.01 KB     6ms
├── lib/async.js                                        795 B     9ms
├── node_modules/balanced-match/index.js                619 B     1ms
└── + 3 more assets

We'll need to use a major version bump for this, since it's a breaking change. I won't land this until I get the update stuff in and working in #640.

[codecov-io]

Codecov Report

Merging #643 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #643      +/-   ##
==========================================
- Coverage   86.56%   86.55%   -0.02%     
==========================================
  Files          16       16              
  Lines        1742     1740       -2     
==========================================
- Hits         1508     1506       -2     
  Misses        234      234

Impacted Files	Coverage Δ
src/filesystem/interface.js	93.28% <ø> (-0.09%)	⬇️
src/shell/index.js	88.32% <ø> (ø)
src/index.js	100% <ø> (ø)	⬆️

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