make tab easily
##Documentation
###Installation
###Options
tabnav: '.easyTab-nav' | string
tabContainer: '.easyTab-container' | string
tabs: '.tab' | string
navBtnSelector: 'a' | string
currentItem: 0 | number
defaultOpen: false | boolean
animTime: 0.5 | number
closable: true | number
###callback
clickfunction: function
onClose: function
onOpen: function
======== ###Ex: