Upgrade back to new Travis containers, add file sizes to output

.travis.yml

@@ -1,17 +1,14 @@
 language: node_js
 node_js:
   - "4.2.1"
-sudo: required
+sudo: false
 before_install:
   - export WAPPALYZER_ROOT=$TRAVIS_BUILD_DIR
   - export WAPPALYZER_NODE_PATH=$TRAVIS_BUILD_DIR
   - export PATH=$PATH:$TRAVIS_BUILD_DIR/bin
 install:
-  - sudo apt-get update -y
-  - sudo apt-get install -y curl zip sudo -y --force-yes
-  - sudo apt-get clean
   - npm install jsonlint jpm imagemin-cli svgo -g
   - ln -s docker/node/package.json package.json && npm install
   - mkdir phantomjs && curl -L https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.8-linux-x86_64.tar.bz2 | tar xvjC phantomjs && ln -s $WAPPALYZER_ROOT/phantomjs/phantomjs-*-linux-x86_64/bin/phantomjs bin/phantomjs
 script: wappalyzer build
-after_script: ls build
+after_script: ls -l --block-size=MB build