Add support for Selenium 3.0.0-beta3

Author: davehunt

Base/Dockerfile

@@ -27,7 +27,8 @@ RUN apt-get update -qqy \
 # Selenium
 #==========
 RUN  mkdir -p /opt/selenium \
-  && wget --no-verbose https://selenium-release.storage.googleapis.com/2.53/selenium-server-standalone-2.53.1.jar -O /opt/selenium/selenium-server-standalone-2.53.1.jar
+  && wget --no-verbose https://selenium-release.storage.googleapis.com/2.53/selenium-server-standalone-2.53.1.jar -O /opt/selenium/selenium-server-standalone-2.53.1.jar \
+  && wget --no-verbose https://selenium-release.storage.googleapis.com/3.0-beta3/selenium-server-standalone-3.0.0-beta3.jar -O /opt/selenium/selenium-server-standalone-3.0.0-beta3.jar
 ENV SELENIUM_VERSION=2.53.1
 
 #========================================