update virtualenv hooks

	modified:   python/virtualenvs/initialize
	modified:   python/virtualenvs/postactivate
	modified:   python/virtualenvs/postdeactivate
	modified:   python/virtualenvs/postmkvirtualenv
	new file:   python/virtualenvs/postrmproject
	modified:   python/virtualenvs/predeactivate
	new file:   python/virtualenvs/prermproject
add helper script for shared functions

	modified:   bashrc
	renamed:    zshrc -> helpers
	modified:   setup.sh
	modified:   zshrc