Revert vector changes, back to PNGs, as android doesn't appear to support vectors as ic_launcher (bleh).

.idea/libraries/library_2_4_0.xml

@@ -4,6 +4,8 @@
       <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.nineoldandroids/library/2.4.0/e9b63380f3a242dbdbf103a2355ad7e43bad17cb/library-2.4.0.jar!/" />
     </CLASSES>
     <JAVADOC />
-    <SOURCES />
+    <SOURCES>
+      <root url="jar://$USER_HOME$/.gradle/caches/modules-2/files-2.1/com.nineoldandroids/library/2.4.0/83d41901478fa8795254244acbafd03f14224dab/library-2.4.0-sources.jar!/" />
+    </SOURCES>
   </library>
 </component>