PLT-3466 E10: Add announcement bar feature (#6509)

* E10 - Add announcement bar feature

* Updates per feedback

* Add component tests and snapshots

* Update snapshots

* Updating color picker UI (#6543)

* Add class to body tag when banner is not dismissable and clean up localstorage items when banner changes

* Fixing links (#6544)

* Updating UI for fixed error bar (#6552)

* Truncating text on fixed banner (#6561)

* Plt 3466 - Error bar link states (#6577)

* Updating error bar hover state

* Updating error bar link states

webapp/components/signup/signup_controller.jsx

@@ -18,7 +18,7 @@ import {addUserToTeamFromInvite, getInviteInfo} from 'actions/team_actions.jsx';
 import {loadMe} from 'actions/user_actions.jsx';
 
 import logoImage from 'images/logo.png';
-import ErrorBar from 'components/error_bar.jsx';
+import AnnouncementBar from 'components/announcement_bar';
 
 import {FormattedMessage} from 'react-intl';
 import {browserHistory, Link} from 'react-router/es6';
@@ -319,7 +319,7 @@ export default class SignupController extends React.Component {
 
         return (
             <div>
-                <ErrorBar/>
+                <AnnouncementBar/>
                 <div className='signup-header'>
                     <Link to='/'>
                         <span className='fa fa-chevron-left'/>