Fix history warning when opening entry.

When clicking on a entry in the listing, a console error would be logged
by `history` (react-router): "Hash history cannot push state; it is
ignored". This was caused because using `bind` in the click handler
caused the return value to be passed to the `history.push` as the second
param. This was ignored in react-router v2, but gives a warning in v4.

src/components/EntryListing/EntryListing.js

@@ -48,7 +48,7 @@ export default class EntryListing extends React.Component {
     return (
       <Card
         key={entry.get('slug')}
-        onClick={history.push.bind(this, path)} // eslint-disable-line
+        onClick={() => history.push(path)} // eslint-disable-line
         className="nc-entryListing-card"
       >
         { image &&