Manually loading the '.profile' since 'virtualenvwrapper' supposedly doesn't support the 'sh' shell (http://virtualenvwrapper.readthedocs.org/en/latest/install.html) and also doesn't support starting a shell with the '-u' option (https://bitbucket.org/dhellmann/virtualenvwrapper/issue/241/support-set-u-in-shell-scripts).