fix: Travis configuration

Author: angeltsvetkov

.travis.yml

@@ -1,11 +1,11 @@
 matrix:
   include:
-    # - stage: "Lint"
-    #   language: node_js
-    #   os: linux
-    #   node_js: "6"
-    #   jdk: oraclejdk8
-    #   script: npm run ci.tslint
+    - stage: "Lint"
+      language: node_js
+      os: linux
+      node_js: "6"
+      jdk: oraclejdk8
+      script: npm run ci.tslint
     - stage: "WebPack"
       os: osx
       env:
@@ -21,7 +21,7 @@ matrix:
         - Platform="Android"
       jdk: oraclejdk8
       before_install: nvm install 6.10.3
-      script: cd ../src && npm run build && cd ../demo && npm i && npm run build-android-bundle && cd ../demo-angular && npm i && npm run build-android-bundle
+      script: cd src && npm run build && cd ../demo && npm i && npm run build-android-bundle && cd ../demo-angular && npm i && npm run build-android-bundle
     - stage: "Build"
       env: 
         - Android="23"