Revert "Upgrade dependencies"

This reverts commit 8c6831e.

Author: msiegenthaler

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:8.8.1
+FROM node:7.4.0
 MAINTAINER Mario Siegenthaler <[email protected]>
 
 RUN npm install -g -s yarn

yarn.lock

@@ -66,8 +66,8 @@ caseless@~0.11.0:
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.11.0.tgz#715b96ea9841593cc33067923f5ec60ebda4f7d7"
 
 casperjs@^1.1.3:
-  version "1.1.4"
-  resolved "https://registry.yarnpkg.com/casperjs/-/casperjs-1.1.4.tgz#eb01f4ed85ac520a8f4d932b4daa74d3e77bc746"
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/casperjs/-/casperjs-1.1.3.tgz#9653de731f8aa44d0915a69ba2233164bb2eaf94"
 
 chalk@^1.1.1:
   version "1.1.3"
@@ -413,7 +413,7 @@ pend@~1.2.0:
   resolved "https://registry.yarnpkg.com/pend/-/pend-1.2.0.tgz#7a57eb550a6783f9115331fcf4663d5c8e007a50"
 
 phantomjs@^2.1.7:
-  version "2.1.7"
+  version "2.1.7+deprecated"
   resolved "https://registry.yarnpkg.com/phantomjs/-/phantomjs-2.1.7.tgz#c6910f67935c37285b6114329fc2f27d5f3e3134"
   dependencies:
     extract-zip "~1.5.0"