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/zim/install.zsh

@@ -0,0 +1,21 @@
+#!zsh
+
+git clone --recursive https://github.com/Eriner/zim.git "${ZDOTDIR:-${HOME}}/.zim"
+
+setopt EXTENDED_GLOB
+for template_file ( ${ZDOTDIR:-${HOME}}/.zim/templates/* ); do
+  user_file="${ZDOTDIR:-${HOME}}/.${template_file:t}"
+  touch ${user_file}
+  ( print -rn "$(<${template_file})$(<${user_file})" >! ${user_file} ) 2>/dev/null
+done
+
+source "${ZDOTDIR:-${HOME}}/.zlogin"
+
+ln -nsf \
+  ~/p9k/ \
+  ~/.zim/modules/prompt/external-themes/powerlevel9k
+ln -nsf \
+  ~/.zim/modules/prompt/external-themes/powerlevel9k/powerlevel9k.zsh-theme \
+  ~/.zim/modules/prompt/functions/prompt_powerlevel9k_setup
+
+sed -i "s/zprompt_theme='steeef'/zprompt_theme='powerlevel9k'/g" ~/.zimrc