Fix React deprecation warnings (#1976)

- Refactor imports of PropTypes to use the prop-types package
- Upgrade dependencies that were setting off deprecation warnings

frontend/components/forms/FormField/FormField.jsx

@@ -1,4 +1,5 @@
-import React, { Component, PropTypes } from 'react';
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
 import classnames from 'classnames';
 
 const baseClass = 'form-field';