Prepare release 3.2

CHANGELOG.txt

+DRD Agent 8.x-3.2, 2017-05-12
+-----------------------------
+  * Load the library only once and fix bug with loading the CCS for the authorisation form
+  * Improve loading the library and ensure to load it only once
+  * Issue #2877807 by jurgenhaas: Make sure we load the library only once and don't re-declare constants
+  * Add missing class
+
 DRD Agent 8.x-3.1, 2017-05-10
 -----------------------------
   * Implement interactive dashboard authorisation