add gridstack.js v0.1.0
Merge pull request #4031 from troolee/master

[author] add gridstack.js
[new] Add twemoji from Twitter (1.1.1)
Merge pull request #4035 from ping/twemoji111

[new] Add twemoji from Twitter (1.1.1)
add es6-shim v0.21.0
add old versions of twemoji
format package.json of twemoji
add angular-ui-bootstrap v0.1.0/0.11.1
add pace v0.6.1
add jsonld v0.3.7
add masonry v3.2.1
add mojio-js v2.2.2/2.2.3
update .gitignore
Added auto update in intro.js
add mathjs v1.1.1
Added intro.js v0.9.0 and 1.0.0

Copied from its GitHub repo
add code mirror v4.8.0
add q.js v1.1.2
add packery v1.3.0
add swagger-ui 2.1.0-alpha.6