Update Linuxfile.sh to always use the latest chromedriver

Author: mdmintz

integrations/linux/Linuxfile.sh

@@ -52,6 +52,7 @@ sudo apt-get -f install -y --force-yes firefox
 
 # Install more dependencies
 sudo apt-get update
+sudo apt-get install -y --force-yes curl
 sudo apt-get install -y --force-yes xvfb
 sudo apt-get install -y --force-yes build-essential chrpath libssl-dev libxft-dev
 sudo apt-get install -y --force-yes libfreetype6 libfreetype6-dev
@@ -75,7 +76,8 @@ sudo apt-get -f install -y --force-yes
 sudo dpkg -i google-chrome-stable_current_amd64.deb
 
 # Install Chromedriver
-sudo wget -N http://chromedriver.storage.googleapis.com/2.36/chromedriver_linux64.zip -P ~/Downloads
+CHROMEDRIVER_VERSION=`curl -sS chromedriver.storage.googleapis.com/LATEST_RELEASE`
+sudo wget -N http://chromedriver.storage.googleapis.com/$CHROMEDRIVER_VERSION/chromedriver_linux64.zip -P ~/Downloads
 sudo unzip -o ~/Downloads/chromedriver_linux64.zip -d ~/Downloads
 sudo chmod +x ~/Downloads/chromedriver
 sudo rm -f /usr/local/share/chromedriver