Upgrade to latest appium plugin

Author: hdeshev

tests/package.json

@@ -57,7 +57,7 @@
         "karma-nativescript-launcher": "^0.4.0",
         "lazy": "1.0.11",
         "mocha": "^2.4.5",
-        "nativescript-dev-appium": "^0.0.10",
+        "nativescript-dev-appium": "^0.0.12",
         "nativescript-dev-typescript": "^0.3.1",
         "typescript": "^1.8.10",
         "wd": "0.4.0"