Updated Dockerfile and build script

Recent changes to snowflake have required some updates to the docker
build file and script.sh including:
- updated go to version 1.12
- removed need for coffeescript
- cleaned up apt-gets
- modified sed to replace the broker URL in embed.js

Dockerfile

@@ -1,11 +1,7 @@
-FROM golang:1.11
-RUN apt-get update && apt-get install -y git libx11-dev tor net-tools sudo gdb strace x11vnc xvfb less apt-transport-https
-## Setting up coffeescript for snowflake proxy
+FROM golang:1.12
 RUN echo "deb https://deb.nodesource.com/node_12.x stretch main\ndeb-src https://deb.nodesource.com/node_12.x stretch main" | tee /etc/apt/sources.list.d/nodesource.list
 RUN curl -sL https://deb.nodesource.com/gpgkey/nodesource.gpg.key | apt-key add -
-RUN apt-get update && apt-get install -y nodejs firefox-esr
-RUN npm install -g coffeescript
-##
+RUN apt-get update && apt-get install -y git libx11-dev tor net-tools sudo gdb strace x11vnc xvfb less apt-transport-https nodejs firefox-esr
 RUN apt-get clean
 RUN useradd -ms /bin/bash snowflake
 RUN adduser snowflake sudo

script.sh

@@ -22,7 +22,7 @@ while :; do
     shift
 done
 
-# we manually copy files locally (avoiding go install so we don't have to recompile everytime)
+# we manually copy files locally (avoiding go install so we don't have to recompile every time)
 
 if [ "$build" -ne "0" ]; then
     #kill broker, proxy, client processes
@@ -45,7 +45,7 @@ if [ "$build" -ne "0" ]; then
     cd ../proxy
     npm run build
     #need to point to our localhost broker instead
-    sed -i 's/snowflake-broker.bamsoftware.com/localhost:8080/' build/snowflake.js
+    sed -i 's/snowflake-broker.freehaven.net/localhost:8080/' build/embed.js
 
     cd /go/src
 fi