* Fixed LHS Team Sidebar on hover highlight.
* Fixed LHS Main Menu on hover tooltip to show "Main menu".
* Added On-hover highlight for Favorite button in channel heading.
* Added active state for channel members icon.
* Added active class based on internal react state with new changeCss rule.
* Changed cursor to pointer on hovering a theme.
* Fixed Invite New Member Add Button to have text-underline on hover.
* Updating client dependancies. Switching to using yarn.
* Updating React
* Moving pure components to using function syntax (performance gains with newer react version)
* Updating client dependancies.
* Ignore .yarninstall
* Enabling pre-lockfile because it's the entire point of using yarn.
* Removing old webpack config
* Moving to new prop-types
* Fixing ESLint Errors
* Updating jest snapshots.
* Cleaning up package.json
