Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

Dockerfile

@@ -1,17 +0,0 @@
-FROM rust:latest
-
-RUN apt-get update && apt-get install -y clang libclang-dev cmake build-essential git unzip autoconf libtool
-
-RUN git clone https://github.com/google/protobuf.git && \
-    cd protobuf && \
-    ./autogen.sh && \
-    ./configure && \
-    make && \
-    make install && \
-    ldconfig && \
-    make clean && \
-    cd .. && \
-    rm -r protobuf
-
-
-RUN mkdir /cargocache && chmod -R ugo+rwX /cargocache