Removing ZSH-specific dotfiles in prep for agnostic
Updated sample files to be truly samples, editable by the user with no side-effects.
Remove unneeded .LS_COLORS. New location is in ~/.shell
Add breadth of new, platform/shell agnostic files
- All shell-agnostic dotfiles added to ~/.shell
- New .zshrc and .bash_profile support loading them
- Also loads userland ~/.path, ~/.alias, etc
  for non-destructive customization
- Updated bootstrap.sh script, which is Bash-only atm
- Updated Readme to reflect changes