update python virtual environment setup

	modified:   zshrc
add default virtualenvs hooks

	new file:   python/virtualenvs/get_env_details
	new file:   python/virtualenvs/initialize
	new file:   python/virtualenvs/postactivate
	new file:   python/virtualenvs/postdeactivate
	new file:   python/virtualenvs/postmkproject
	new file:   python/virtualenvs/postmkvirtualenv
	new file:   python/virtualenvs/postrmvirtualenv
	new file:   python/virtualenvs/preactivate
	new file:   python/virtualenvs/predeactivate
	new file:   python/virtualenvs/premkproject
	new file:   python/virtualenvs/premkvirtualenv
	new file:   python/virtualenvs/prermvirtualenv
add virtualenv setup and env ignoring

	modified:   .gitignore
	modified:   setup.sh
add ipython to all new environments

	modified:   python/virtualenvs/postmkvirtualenv
fix pipe redirection