Add spongy castle sources to libraries folder

libraries/spongycastle/bc-build.properties

@@ -0,0 +1,8 @@
+
+release.suffix: 150
+release.name: 1.50
+release.debug: false
+
+mail.jar.home: /opt/javamail/mail.jar
+activation.jar.home: /opt/jaf/activation.jar
+junit.jar.home: /opt/junit/junit.jar