Make tar.gz a bundled dependency

Don't bother unpacking sqlite if we're not using it

Move some protected methods to public

Avoid writing to freed memory

Make sure the INSERT completes before trying the SELECT

disable the loadExtension test which will crash when the extension is built against a different external sqlite version than the bundled one (which is likely)

move test/tmp directory creation to sync to avoid race to create directory which will appear as'Error: done() called multiple times' - refs visionmedia/mocha#316

Unpack sqlite dep dynamically and move build node_sqlite3.node module into ./lib folder

add support for dynamically unpacking the bundled sqlite3 dep to avoid having to store the uncompressed files in git

Starting with version 4.8 gcc complains about attempts to pass these
protected methods to NODE_SET_PROTOTYPE_METHOD as the callback.

The handle here is actually the uv_async_t object named watcher that
is part of the Async object so we shouldn't try and write to it after
the Async object has been freed.

Conflicts:
	test/fts-content.test.js
	test/scheduling.test.js

fix scheduling.test.js against variable sqlite3 versions - closes #122 (thanks @tomhughes for initial patch)

fix the fts test added in 42aa8c88, which was not valid for expresso and must never have worked (just hung)