Updated travis config : install ghostscript, required for Html2Image

.travis.yml

@@ -10,6 +10,11 @@ jdk:
 # only `sudo: true` allows running tests on Travis CI container infrastructure for faster builds, but testing installation of .deb makes sense
 sudo: true
 
+# Installing ghostcript (optional imagemagick dependency) is required for Html2ImageTest to run
+before_install:
+  - sudo apt-get -qq update
+  - sudo apt-get install -y ghostcript
+
 install:
 - cd libbuild && MAVEN_OPTS="-Xmx6g -Xms2g" mvn clean install && cd ..
 

source/net/yacy/cora/util/Html2Image.java

@@ -65,7 +65,7 @@ public class Html2Image {
     private final static File convertMac2 = new File("/opt/ImageMagick/bin/convert");
     
     // debian
-    // to install: apt-get install wkhtmltopdf imagemagick xvfb
+    // to install: apt-get install wkhtmltopdf imagemagick xvfb ghostscript
     private final static File wkhtmltopdfDebian = new File("/usr/bin/wkhtmltopdf"); // there is no wkhtmltoimage, use convert to create images
     private final static File convertDebian = new File("/usr/bin/convert");