Tabs Review Updates

[Darper]

A list of updates to make to Tabs, Tab, TabList, and TabPanel after doing a group code review.

• Change onSelect to onChange in Tabs.js
• Add onBeforeChange
• Replace cwrp with componentDidUpdate
• Change selectedIndex to activeIndex
• Kill TabList if possible
• Ignore selected prop in Tab docs if only used as pass through from parent, otherwise kill
• Change setSelectedTab in Tab to onChange and return active state
• Move padding from .bordered to .tabPanel in TabPanel
• Change bordered prop to border
• Kill icon prop
• Kill tabIndex prop
• Ignore vertical prop in Tab docs
• Change Tabs to TabList
• Kill Tab
• Rename TabPanel to Tab and offer title prop which accepts a node
• TabList (new) will loop through Tab components, get titles, and create Tab Header div