Merge pull request #15 from ivanzhaowy/master

Merge
Merge pull request #16 from ivanzhaowy/master

Update Travis config
Add MessengerJS
Add parameter to `open()`
Update hook demo
Use `attr()` instead of `css()` to set CSS
Use jQuery 1.x
Merge pull request #17 from netputer/master

Communicate between iframe
Close when click background
Update style of background
Merge branch 'root/master'
Merge pull request #18 from netputer/master

Update about background
Add more line to demo
Add position fixed to $ctn
Add z-index to $ctn
Add fallback to redirect
Merge pull request #19 from netputer/master

Update
Use HTTP API in IE
Merge pull request #20 from netputer/master

Use HTTP API in IE
Update fallback url