Update .travis.yml

Update emulator api level to 23

Author: SvetoslavTsenov

Diff for: .travis.yml

@@ -12,7 +12,7 @@ android:
   - build-tools-23.0.1
   - android-23
   - extra-android-m2repository
-  - sys-img-armeabi-v7a-android-19
+  - sys-img-armeabi-v7a-android-23
 before_cache:
 - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
 cache:
@@ -40,7 +40,7 @@ script:
 - 
 - tns build android
 - android-wait-for-emulator
-- npm run run-appium-android
+- npm run run-appium-android-23
 before_deploy:
 - cd ../nativescript-angular
 - npm install -g nativescript --ignore-scripts