websockets / ws / 1211

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Pull #1018

travis-ci

Receiver support binaryType ‘fragments’ - emit message fragments array to avoid copyfull concat

Note:
binaryType used to affect before only in WHATWG API emulation
and the optional conversion to ArrayBuffer was done inside MessageEvent.
However in this change the receiver emits messages according to binaryType
so now also EventEmitter listeners added with on(‘message’, data => {})
will get the data according to binaryType.

Use array indexOf instead of includes for node v4

Test updating binaryType after receiver already created

Get rid of constants.DEFAULT_BINARY_TYPE

.gitignore += .vscode

use var due to possible deoptimizations

binaryType handle set to invalid enum by warn and ignore (like chrome)

Receiver test use Sender.frame to create frames

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