Reorganised Guice modules. Contribute entropy to pool on Linux/Android.

briar-api/src/org/briarproject/api/system/SeedProvider.java

@@ -0,0 +1,12 @@
+package org.briarproject.api.system;
+
+/**
+ * Uses a platform-specific source to provide a seed for a pseudo-random
+ * number generator.
+ */
+public interface SeedProvider {
+
+	int SEED_BYTES = 32;
+
+	byte[] getSeed();
+}