Add database option support to DB.append

src/db.coffee

@@ -173,17 +173,18 @@ class DB
 
   append: (key, value, args...) ->
     switch args.length
-      when 1 then callback = args[0]
+      when 1
+        options = {}
+        callback = args[0]
       when 2
-        database = args[0]
+        options  = args[0]
         callback = args[1]
       else
         throw new Error("Invalid number of arguments (#{args.length}) to append");
 
-    rpc_args =
-      key: key
-      value: value
-    rpc_args.DB = database if database?
+    rpc_args       = this._initRpcArgs options
+    rpc_args.key   = key
+    rpc_args.value = value
     @rpcClient.call 'append', rpc_args, (error, status, output) ->
       if error?
         callback error, output

test/db_test.coffee

@@ -183,6 +183,16 @@ module.exports =
           test.equal value, "Value"
           test.done()
 
+    'allows the database to be specified': (test) ->
+      test.expect 2
+      db.append 'test', 'other db', {database: 'test2.kct'}, (error, output) ->
+        test.ifError error
+
+        # Check that the value wasn't set on the default db
+        db.get 'test', (error, value) ->
+          test.ok value == null
+          test.done()
+
   increment: testCase
     setUp: dbClear