Move grunt npm install before ADDs, so we don't have to download all the packages on every build

Dockerfile.web

@@ -22,15 +22,18 @@ RUN apt-get remove -y --auto-remove python-dev g++ libjpeg62-dev libevent-dev li
 ADD binary_dependencies binary_dependencies
 RUN gdebi --n binary_dependencies/*.deb
 
-# Grunt
+# Install Grunt
 RUN ln -s /usr/bin/nodejs /usr/bin/node
 RUN npm install -g grunt-cli
 
+# Install Grunt depenencies
+ADD grunt grunt
+RUN cd grunt && npm install
+
 # Add all of the files!
 ADD . .
 
 # Run grunt
-RUN cd grunt && npm install
 RUN cd grunt && grunt
 
 ADD conf/init/svlogd_config /svlogd_config