mochajs / mocha / 3859

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fix bundling; closes #3091

This became too difficult to manage on the command-line.

What we're trying to do here is ship a version of the `Buffer` shim
which plays well with IE9/IE10.  Browserify ships with a version which
does NOT play well, meaning we have to force it to use the version
we choose (`buffer@4.9.x`).

The fix is in two parts:

1.  `insertGlobalVars` option replaces usages of global `Buffer` with
`require('/path/to/mocha/node_modules/buffer').Buffer`
2.  Any *other* module which explicitly requires `buffer` or, yes,
`buffer/`, must *also* use `/path/to/mocha/node_modules/buffer`

If *both* of these are not in place, Browserify will use its *own*
version of the `buffer` shim.

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