test-in-docker: quickly test frameworks in docker

This adds `./test-in-docker` for quickly playing with various frameworks.

All the containers are based off Ubuntu 14.04 which has ZSH 5.0.2.

Thanks to @dritter for figuring out all the framework installation
methods.

docker/zpm/Dockerfile

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+FROM p9k:base
+
+COPY docker/zpm/install.zsh /tmp/
+RUN zsh /tmp/install.zsh
+
+COPY ./ p9k/
+COPY docker/zpm/zshrc .zshrc

docker/zpm/install.zsh

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+# install zpm
+git clone --recursive https://github.com/zpm-zsh/zpm.git ~/.zpm
+
+# Install powerlevel9k
+mkdir ~/.zpm/plugins/powerlevel9k
+ln -s ~/p9k/powerlevel9k.zsh-theme ~/.zpm/plugins/powerlevel9k/powerlevel9k.plugin.zsh

docker/zpm/zshrc

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+source ~/.zpm/zpm.zsh
+
+zpm load powerlevel9k