Merge branch 'add/golang' into 'master'

Add golang image

See merge request !2

golang/latest/Dockerfile

+# Base image: https://hub.docker.com/_/golang/
+FROM golang:latest
+MAINTAINER ethitter
+
+# Install golint
+ENV GOPATH /go
+ENV PATH ${GOPATH}/bin:$PATH
+RUN go get -u github.com/golang/lint/golint
+
+# Add apt key for LLVM repository
+RUN wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add -
+
+# Add LLVM apt repository
+RUN echo "deb http://apt.llvm.org/stretch/ llvm-toolchain-stretch-5.0 main" | tee -a /etc/apt/sources.list
+
+# Install clang from LLVM repository
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    clang-5.0 \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
+
+# Set Clang as default CC
+ENV set_clang /etc/profile.d/set-clang-cc.sh
+RUN echo "export CC=clang-5.0" | tee -a ${set_clang} && chmod a+x ${set_clang}