Remove e2e tests from Travis

.travis.yml

@@ -1,39 +1,15 @@
-dist: 'trusty'
-language: java
-jdk:
-  - oraclejdk8
-env:
-  - NODE_VERSION=6.10.1
+language: node_js
+node_js:
+  - 'node' # Latest stable Node.js release
 cache:
   directories:
     - src/node_modules/
-services:
-  - postgresql
-addons:
-  postgresql: '9.6'
-  apt:
-    sources:
-      - google-chrome
-    packages:
-      - google-chrome-stable
-before_install:
-  - export CHROME_BIN=chromium-browser
-  - export DISPLAY=:99.0
-  - sh -e /etc/init.d/xvfb start
-  - cd src
-install:
-  - nvm install $NODE_VERSION
-  - npm install
+env:
+  - ON_TRAVIS=true
+before_install: cd src
 before_script:
-  - ../.travis/before_script.sh
-  - ./node_modules/protractor/bin/webdriver-manager update
+  - npm install
 script:
-  - nvm use $NODE_VERSION
   - npm run test
-  - npm run dev &> .lisk-nano.log &
-  - sleep 20
-  - npm run e2e-test
-after_script:
-  - cat .protractor.log
-  - cat .lisk-core.log
-  - cat .lisk-nano.log
+  - npm run build
+