Merge pull request #12 from esbb48/addBeforeOpenFunction

Add before open function

Added some diff.

Fixed bug.

Fixed bug that the same event handler exists more than once.

Merge pull request #11 from Vincentcdw/master

fix issue #10:

Added return to avoid bugs.

Merge pull request #9 from esbb48/fix_overlay_bug

add modal-open class when showOverlay is true

Merge pull request #8 from esbb48/change_settimout

change document ready become settimeout

Updated example and readMe.

Merge branch 'master' into gh-pages