Change project directory environment variable

[defrank]

Using $ZSH for the project root directory conflicts with zsh projects and plugins (e.g., oh-my-zsh). Change $ZSH -> $DOTFILES.

WIP: defrank/dotfiles#8/b

[holman]

This has come up a few times in the past; previously I've sided along the lines of being -1 because I didn't want to cause a lot of conflicts for existing users. Willing to reconsider, though; what are other people's thoughts on this?

[jacobwgillespie]

Based on the number of times this comes up, it seems worth it to rename. 😃 $DOTFILES is the first suggested alternate that sounds like it belongs to me.

+1 from me.

[defrank]

tag v2.0 for breaking backwards compatibility 👍

If this gets approved, then for anyone that relied on $ZSH in there addons:

git grep 'ZSH'

[ErikMHummel]

Another vote as my personal fork has this implemented.