prompt v2; defunct git pwd highlighting.

Add:
	zshrc
		-add second version of prompt, with an attempt at selective highlighting
		of the pwd (directories that are part of a git project are highlighted a
		different color than the vanilla path)
		-not entirely functional, and the prompt configuration infrastructure
		will probably be reworked
Finalize zshell prompt; working path colors.

Add:
	zsh/
		-add directory for zshell scripts, to be sourced by zshrc

	zsh/prompt.zsh
		-add some documentation to each function
		-any directories inside a git archive are highlighted a color different
		from the rest of the path
Mod:
	zshrc, zsh/prompt.zsh
		-move prompt configuration form zshrc to a seperate "prompt.zsh" file in
		zsh/, for greater modularity.