fix React warnings

src/components/app/index.jsx

@@ -11,7 +11,6 @@ import AppNav from './nav';
 import Footer from './footer';
 
 const App = React.createClass({
-  mixins: [History],
   componentDidMount() {
     SettingsStore.on('change:tableLayout', this.onChange);
     this._historyListener = history.listen(this.storeHistory);

src/components/app/saved-filters.jsx

@@ -31,7 +31,6 @@ const AddFilterModal = React.createClass({
 });
 
 const SavedFiltersButton = React.createClass({
-  mixins: [History],
   getInitialState() {
     return {showModal: false};
   },

src/components/by-milestone-view.jsx

@@ -54,7 +54,7 @@ const KanbanColumn = React.createClass({
 
     if (isShowingColumn) {
       return (
-        <BS.Col key={milestone && milestone.title || 'no-milestone'} xl={2} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
+        <BS.Col key={milestone && milestone.title || 'no-milestone'} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
           <IssueList
             title={heading}
             milestone={milestone}

src/components/by-user-view.jsx

@@ -37,7 +37,7 @@ const KanbanColumn = React.createClass({
     );
 
     return (
-      <BS.Col key={login} xl={2} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
+      <BS.Col key={login} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
         <IssueList title={heading}>
           {issueComponents}
         </IssueList>
@@ -73,6 +73,7 @@ const MilestonesView = React.createClass({
       /*HACK: Column should handle milestones */
       return (
         <KanbanColumn
+          key={kanbanColumnCount}
           login={login}
           cards={columnCards}
           primaryRepoName={repoName}

src/components/dashboard.jsx

@@ -113,7 +113,6 @@ const RepoItem = React.createClass({
 });
 
 const RepoGroup = React.createClass({
-  mixins: [History],
   getInitialState() {
     return {selectedRepos: {}};
   },
@@ -242,7 +241,6 @@ const Dashboard = React.createClass({
 });
 
 const CustomRepoModal = React.createClass({
-  mixins: [History],
   getInitialState() {
     return {customRepoName: null};
   },

src/components/label-badge.jsx

@@ -41,7 +41,7 @@ const LabelBadge = React.createClass({
       return (
         <Link to={getFilters().toggleTagName(label.name).url()}
           key={name}
-          {...this.props}
+          onClick={onClick}
           className={className}
           style={{backgroundColor: '#' + label.color}}>
           {icon}

src/components/repo-kanban.jsx

@@ -64,7 +64,7 @@ const KanbanColumn = React.createClass({
 
     if (issueComponents.length || SettingsStore.getShowEmptyColumns()) {
       return (
-        <BS.Col key={label.name} xl={2} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
+        <BS.Col key={label.name} lg={3} md={4} sm={6} xs={12} className='kanban-board-column'>
           <IssueList
             icon={icon}
             title={title}