Add delegated as base for future libsodium bindings, update travis yml to include it, start updating readme

linuxBuild.sh

@@ -16,6 +16,8 @@ fi
 #now we can do the delegated build
 cd ..
 ./gradlew multiplatform-crypto-delegated:build
+#build libsodium bindings
+./gradlew multiplatform-crypto-libsodium-bindings:build
 #and finally pure build
 ./gradlew multiplatform-crypto:build
 set +e