Fix stringified buffer who not allow base64 change

[feraudet]

Fix #359

[peoro]

This PR is badly needed, binary data cannot be sent to the server otherwise.

In case anybody cares, I found a hacky way to achieve the effect of this PR:

// HACK: ldapjs calls `toString()` on a buffer when it shouldn't...
// See https://github.com/joyent/node-ldapjs/pull/383
picture.toString = function() { return this; };

const entry = {
	operation: 'replace',
	modification: {
		'jpegPhoto': picture
	}
};

return client.modify( `cn=${user},ou=People,dc=peori,dc=space`, entry );

[HappyHappy1996]

@peoro thanks, it saved me lots of time, a smart and tricky solution

[jsumners]

Can you please add some unit tests for this?

[jsumners]

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