Update phantomjs to 2.0.0

* Version 1.9 was removed from upstream Debian repos

scripts/prepare_build.sh

 #!/bin/bash
 if [ -f /.dockerinit ]; then
-    wget -q http://ftp.de.debian.org/debian/pool/main/p/phantomjs/phantomjs_1.9.0-1+b1_amd64.deb
-    dpkg -i phantomjs_1.9.0-1+b1_amd64.deb
+    wget -q http://ftp.de.debian.org/debian/pool/main/p/phantomjs/phantomjs_2.0.0+dfsg-1_amd64.deb
+    dpkg -i phantomjs_2.0.0+dfsg-1_amd64.deb
     apt-get update -qq
     apt-get install -y -qq libicu-dev libkrb5-dev cmake nodejs postgresql-client mysql-client