Update BaseComponent.jsx (shakacode#351)

Change in the BaseComponent as it seems to be using the `PureRenderMixin` mixin. The react docs states that we should consider using React.PureComponent instead, which essentially does the same shallow compare.

* Update BaseComponent.jsx
* removes pure-render-mixin from dependencies

Author: cubadomingo

client/app/libs/components/BaseComponent.jsx

@@ -1,8 +1,4 @@
 import React from 'react';
-import PureRenderMixin from 'react-addons-pure-render-mixin';
 
-export default class BaseComponent extends React.Component {
-  shouldComponentUpdate(theArgs) {
-    return PureRenderMixin.shouldComponentUpdate.apply(this, ...theArgs);
-  }
-}
+export default class BaseComponent extends React.PureComponent {
+};

client/npm-shrinkwrap.json

@@ -71,7 +71,6 @@
     "postcss-loader": "^1.1.1",
     "react": "^15.4.1",
     "react-addons-css-transition-group": "^15.4.1",
-    "react-addons-pure-render-mixin": "^15.4.1",
     "react-bootstrap": "^0.30.7",
     "react-dom": "^15.4.1",
     "react-on-rails": "^6.2.1",

client/package.json

@@ -31,7 +31,6 @@ module.exports = {
       'immutable',
       'lodash',
       'marked',
-      'react-addons-pure-render-mixin',
       'react-bootstrap',
       'react-dom',
       'react-redux',