feat(bluebird): patch bluebird promise and treat it as microtask

[JiaLiPassion]

fix#455.

patch bluebird promise in zone and treat it as microTask,
add testcases for all bluebird APIs.

-usage, node

require('zone-node.js');
const Bluebird = require('bluebird');
require('zone-bluebird.js');
Zone[Zone['__symbol__']('bluebird')](Bluebird);

• usage, browser

 <script src="zone.js"></script>
<script src="bluebird.js"></script>
<script src="zone-bluebird.js"></script>
<script>
Zone[Zone['__symbol__']('bluebird')](Promise);
</script>

We can simplify those steps to automatically patch Bluebird Promise, if global.Promise is Bluebird, but Bluebird maybe used just as a library (such as by sequelize), so I think patch it explicitly will be much safer.

[mhevery]

Don't include dist folder when you create a PR. I will update the dist folder during the release.

[JiaLiPassion]

OK, got it, I will remove it.