Rename Register/UnregisterApplication to Create/DestroyApplication

Create/Destroy makes more sense since the application is created on the
bluetoothd side whereas what's really registered is an agent on the
caller side. This way the call is similar to e.g. CreatePairedDevice,
and so the parameter order should also be config first and then the
agent.
diff --git a/doc/health-api.txt b/doc/health-api.txt
index 6b5a485..f469df3 100644
--- a/doc/health-api.txt
+++ b/doc/health-api.txt
@@ -14,7 +14,7 @@
 
 Methods:
 
-	object	RegisterApplication(object agent, dict config)
+	object	CreateApplication(dict config, object agent)
 
 		Returns the path of the new registered application. The agent
 		parameter is the path of the object with the callbacks to
@@ -35,7 +35,7 @@
 
 		Possible errors: org.bluez.Error.InvalidArguments
 
-	void	UnregisterApplication(object application)
+	void	DestroyApplication(object application)
 
 		Closes the HDP application identified by the object path. Also
 		application will be closed if the process that started it leaves