Tidy up and consolidate both README.rst/README.md into one. Introduce linux-armv5.

linux-armv5/Dockerfile

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+FROM thewtex/cross-compiler-base
+MAINTAINER Matt McCormick "matt.mccormick@kitware.com"
+
+# This is for ARMv5 "legacy" devices which do not support hard float VFP instructions.
+# https://wiki.debian.org/CrossToolchains
+RUN dpkg --add-architecture armel && \
+    apt-get update && \
+    apt-get install -y crossbuild-essential-armel
+
+# The cross-compiling emulator
+RUN apt-get update && apt-get install -y \
+  qemu-user \
+  qemu-user-static
+
+ENV CROSS_TRIPLE arm-linux-gnueabi
+ENV CROSS_ROOT /usr/bin
+ENV AS=/usr/bin/${CROSS_TRIPLE}-as \
+    AR=/usr/bin/${CROSS_TRIPLE}-ar \
+    CC=/usr/bin/${CROSS_TRIPLE}-gcc \
+    CPP=/usr/bin/${CROSS_TRIPLE}-cpp \
+    CXX=/usr/bin/${CROSS_TRIPLE}-g++ \
+    LD=/usr/bin/${CROSS_TRIPLE}-ld
+
+ENV QEMU_LD_PREFIX ${CROSS_ROOT}/libc
+ENV QEMU_SET_ENV "LD_LIBRARY_PATH=${CROSS_ROOT}/lib:${CROSS_ROOT}/libc/lib/${CROSS_TRIPLE}/"

linux-armv5/Toolchain.cmake

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+set(CMAKE_SYSTEM_NAME Linux)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR arm)
+
+set(cross_triple "arm-linux-gnueabi")
+
+set(CMAKE_C_COMPILER /usr/bin/${cross_triple}-gcc)
+set(CMAKE_CXX_COMPILER /usr/bin/${cross_triple}-g++)
+set(CMAKE_Fortran_COMPILER /usr/bin/${cross_triple}-gfortran)
+
+set(CMAKE_FIND_ROOT_PATH /usr/${cross_triple} /usr/${cross_triple}/libc/usr)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+set(CMAKE_CROSSCOMPILING_EMULATOR /usr/bin/qemu-arm)