arrow

ARROW-1479: [JS] Expand JavaScript implementation

Finally PR'ing https://github.com/graphistry/arrow to the official Arrow project

Primary motivations:
- Multi-part ArrowReader to support async and streaming
- ArrowReader and related types as native JS iterators (and soon, async iterators)
- Unify vectors across RecordBatches into a single logical virtual instance
- Fast vector subarray/slice to dense typed Arrays (handy for GPU compute)

Example:

```js
import { readFileSync } from 'fs';
import { Table } from 'apache-arrow';

const table = Table.from(...[
    'latlong/schema.arrow',
    'latlong/records.arrow'
].map((file) => readFileSync(file)));

const column = table.getColumn('origin_lat');
const typed = column.slice();

assert(typed instanceof Float32Array);

for (let i = -1, n = column.length; ++i < n;) {
    assert(column.get(i) === typed[i]);
}

console.log(table.toString());

/*
        origin_lat,         origin_lon
35.393089294433594,  -97.6007308959961
35.393089294433594,  -97.6007308959961
35.393089294433594,  -97.6007308959961
29.533695220947266, -98.46977996826172
29.533695220947266, -98.46977996826172
*/
```

Todos:
- ArrowWriter
- Map type?
- [`readBuffersAsync`/`readStreamAsync`](https://github.com/graphistry/arrow/issues/8)
- fix prepublish script for Arrow project CI/deploy strategy

Author: Paul Taylor <paul.e.taylor@me.com>

Closes #1062 from trxcllnt/new-arrow-js and squashes the following commits:

4f71e769 [Paul Taylor] add more rat excludes and delete changelog
fc01b80a [Paul Taylor] Update license/docs per Wes's feedback
5f66c097 [Paul Taylor] add .npmrc to rat exlusions
927ce614 [Paul Taylor] Merge branch 'master' into new-arrow-js
f6da81eb [Paul Taylor] Fix rat exlusions, add header to prepublish script
aff1fdb9 [Paul Taylor] Tweak the JS CI scripts, fix case-sensitive file name in git
8b9208a1 [Paul Taylor] Merge branch 'master' into new-arrow-js
4a74d856 [Paul Taylor] Update CI scripts for new Arrow JS lib
28261892 [Paul Taylor] chore(js): Move graphistry/arrow into apache/arrow