Bind build support, further Yggdrasil demo updates (#1152)

* Add gobind builds for Yggdrasil demo

* Massage client API a bit

* Fix build

* Fix gobind build

* Fix gobind client API setup

* Tweaks

* Tweaks

* Update sytest-whitelist, add comment

* Default to sending push rules on initial sync

build/gobind/platform_other.go

@@ -0,0 +1,12 @@
+// +build !ios
+
+package gobind
+
+import "log"
+
+type BindLogger struct{}
+
+func (nsl BindLogger) Write(p []byte) (n int, err error) {
+	log.Println(string(p))
+	return len(p), nil
+}