Fix js-modal-close listener

• remove event.preventDefault(); on js-modal-close attached listener. Thanks to @jpyrat !

Issue fixed on VoiceOver

Fix issue on VO/Mac

Close #21

v1.8.0

• Added attribute data-modal-focus-id (gives focus to an element in modal)
• Added attribute aria-haspopup (enhances accessibility)

v1.7.1

• Added attribute data-modal-close-img (image for close button)
• Enhanced compatibility with jQuery 2.x/3.x versions

1st release

Add type="button" to button

Added type="button" on generated buttons : This avoid problems in Sharepoint and in forms (closed #17).