Update

Author: SvetoslavTsenov

.travis.yml

@@ -37,10 +37,11 @@ install:
 - npm install
 - npm run tslint
 - cd ../tests
-- tns plugin remove tns-core-modules
+- tns platform remove android && true
+- tns plugin remove tns-core-modules && true
 - npm install
 - tns platform add android@next
-- tns plugin add tns-core-modules@next
+- npm install --dev tns-core-modules@next 
 before_script:
   - echo no | android create avd --force -n test -t android-$EMULATOR_API_LEVEL --abi $ANDROID_ABI
   - emulator -memory 1024 -avd test -no-audio -no-window &