added SLDSButton to SLDS index

Author: ivansfdc

components/index.js

@@ -11,8 +11,10 @@ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 
 import SLDSPicklistBase from './SLDSPicklistBase';
 import SLDSSettings from './SLDSSettings';
+import SLDSButton from './SLDSButton';
 
 module.exports = {
   SLDSPicklistBase: SLDSPicklistBase,
-  SLDSSettings: SLDSSettings
+  SLDSSettings: SLDSSettings,
+  SLDSButton: SLDSButton
 };