Quite a lot going on in this PR:
 * Updates to support recent emscripten, switching to WASM which is now the default
 * Use emscripten's MODULARIZE option rather than wrapping it ourself, since doing
   so in pre-post js doesn't work anymore.
 * Most changes are moving the emscripten runtime functions to top-level
   calls rather than in the Module object.
 * Get rid of duplicated NULL_BYTE_PADDING_LENGTH
 * Fix ciphertext_length used without being declared
 * Fix things that caused the closure compiler to error, eg. using
   OLM_OPTIONS without a declaration.
 * Wait until module is inited to do OLM_ERROR = olm_error()

The main BREAKING CHANGE here is that the module now needs to initialise
asyncronously (because it has to load the wasm file). require()ing olm
now gives a function which needs to be called to create an instance.
The resulting object has a promise-like then() method that can be used
to detect when the module is ready. (We could use MODULARIZE_INSTANCE
to return the module directly as before, rather than the function,
but then we don't get the .then() method).

gradle 2.14.1 to 4.7
build tools 21.1.2 to 27.0.3
build gradle 2.1.3 to 3.1.3

Patch received in https://github.com/matrix-org/olm/issues/13

Patch has been received by e-mail, Signed-off-by: Arnaud Fontaine <arnaud.fontaine@ssi.gouv.fr>

Signed-off-by: Wilfried Klaebe <w+gitstuff@chaos.in-kiel.de>

The code for this change is taken from
https://stackoverflow.com/a/30225575/4929236



This patch is Signed-Off-By: Marcel Radzio <marcel@radzio-sh.de>

From 4a82d31e8cb808a04956fc847ed0ec0ff322b956 Mon Sep 17 00:00:00 2001
From: Hubert Chathi <hubert@uhoreg.ca>
Date: Wed, 3 Jan 2018 21:37:43 -0500
Subject: [PATCH] fix some typos in JavaScript library

Signed-off-by: Hubert Chathi <hubert@uhoreg.ca>

because we may not have pep8 installed at the system level

Signed-off-by: Alexey Rusakov <ktirf@users.sf.net>

This disrupts building at least with Visual Studio.

Signed-off-by: Alexey Rusakov <ktirf@users.sf.net>

Signed-off-by: Hubert Chathi <hubert@uhoreg.ca>

It's not much use if everything is hardcoded.

Merge master into patched branch to fix conflicts prior to merge back to master

Fix line lengths in newly-added code

Signed-off-by: Alexander Maznev <alexander.maznev@gmail.com>

Signed-off-by: Alexander Maznev <alexander.maznev@gmail.com>