Revert "refactor Dockerfile"

Dockerfile

@@ -0,0 +1,39 @@
+FROM ubuntu:14.04.2
+
+## Environment setup
+ENV HOME /root
+ENV GOPATH /root/go
+ENV PATH /root/go/bin:/usr/local/go/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
+
+RUN mkdir -p /root/go
+ENV DEBIAN_FRONTEND noninteractive
+
+## Install base dependencies
+RUN apt-get update && apt-get upgrade -y
+RUN apt-get install -y git mercurial build-essential software-properties-common wget pkg-config libgmp3-dev libreadline6-dev libpcre3-dev libpcre++-dev
+
+## Install Qt5.4.1 (not required for CLI)
+# RUN add-apt-repository ppa:beineri/opt-qt541-trusty -y
+# RUN apt-get update -y
+# RUN apt-get install -y qt54quickcontrols qt54webengine mesa-common-dev libglu1-mesa-dev
+# ENV PKG_CONFIG_PATH /opt/qt54/lib/pkgconfig
+
+# Install Golang
+RUN wget https://storage.googleapis.com/golang/go1.4.2.linux-amd64.tar.gz
+RUN tar -C /usr/local -xzf go*.tar.gz && go version
+
+# this is a workaround, to make sure that docker's cache is invalidated whenever the git repo changes
+ADD https://api.github.com/repos/ethereum/go-ethereum/git/refs/heads/develop file_does_not_exist
+
+## Fetch and install go-ethereum
+RUN mkdir -p $GOPATH/src/github.com/ethereum/
+RUN git clone https://github.com/ethereum/go-ethereum $GOPATH/src/github.com/ethereum/go-ethereum
+WORKDIR $GOPATH/src/github.com/ethereum/go-ethereum
+RUN git checkout develop
+RUN GOPATH=$GOPATH:$GOPATH/src/github.com/ethereum/go-ethereum/Godeps/_workspace go install -v ./cmd/geth
+
+## Run & expose JSON RPC
+ENTRYPOINT ["geth", "-rpc=true", "-rpcport=8545"]
+EXPOSE 8545
+
+