Add erlang-dev docker files

dockerfiles/erlang-dev/17.5/Dockerfile

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+FROM msaraiva/erlang:17.5
+MAINTAINER Tom Parker <palfrey@tevp.net>
+
+RUN apk --update add erlang17-dev erlang17-reltool && rm -rf /var/cache/apk/*
+
+CMD ["/bin/sh"]

dockerfiles/erlang-dev/18.1/Dockerfile

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+FROM msaraiva/erlang:18.1
+MAINTAINER Tom Parker <palfrey@tevp.net>
+
+RUN apk --update add erlang-dev erlang-reltool && rm -rf /var/cache/apk/*
+
+CMD ["/bin/sh"]

dockerfiles/erlang-dev/18.1/README.md

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+Erlang/OTP development on Alpine Linux
+=====
+
+Erlang/OTP development environment.
+
+Latest version: **18.1**
+Image size: **22.37 MB**
+
+See [Erlang/Elixir on Alpine Linux](https://github.com/msaraiva/alpine-erlang) to learn more about creating **minimal Erlang/Elixir docker images with Alpine Linux**.
+
+The following packages are pre-installed:
+
+- ncurses-libs
+- erlang-kernel
+- erlang-stdlib
+- erlang-compiler
+- erlang
+- erlang-dev
+- erlang-reltool
+
+> **Notice:** In order to keep images as compact as possible, Erlang libraries for Alpine Linux are split into many different packages. The full list of Erlang packages available can be found [here](http://pkgs.alpinelinux.org/packages?package=erlang%25&repo=all&arch=x86_64)
+
+## Usage
+
+```
+$ docker run --rm -it msaraiva/erlang-dev erl
+Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:4:4] [async-threads:10] [kernel-poll:false]
+
+Eshell V7.1  (abort with ^G)
+1> io:fwrite("Hello, world!\n").
+Hello, world!
+ok
+2>
+```