Fix a bunch of linting errors

eslint --fix and a few manual ones

src/components/views/rooms/MessageComposer.js

@@ -367,7 +367,7 @@ export default class MessageComposer extends React.Component {
             </div>
         );
     }
-};
+}
 
 MessageComposer.propTypes = {
     tabComplete: React.PropTypes.any,