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/fields/SelectTargetsDropdown/SelectTargetsMenu/SelectTargetsMenu.jsx

@@ -1,4 +1,5 @@
-import React, { PropTypes } from 'react';
+import React from 'react';
+import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import { filter, includes, isEqual, noop } from 'lodash';
 

frontend/components/forms/fields/SelectTargetsDropdown/SelectTargetsMenu/SelectTargetsMenu.tests.jsx

@@ -1,4 +1,5 @@
-import React, { PropTypes } from 'react';
+import React from 'react';
+import PropTypes from 'prop-types';
 import expect, { createSpy, restoreSpies } from 'expect';
 import { mount } from 'enzyme';
 import { noop } from 'lodash';