Fix virtualenvwrapper to work with fabric

Fabric is nice to deploy websites, and virtualenv with virtualenvwrapper are a must to handle dependencies in python projects. When you install virtualenvwrapper you add some lines to your .bashrc file so it can do its magic, something like:

if [ -f /usr/local/bin/virtualenvwrapper.sh ] 
then
    source /usr/local/bin/virtualenvwrapper.sh
fi

The problem appears when you try to use the virtualenvwrappers commands from within a fabric task, for example:

def deploy():
    code_dir = '/srv/yourwebsite'
    with cd(code_dir):
        with prefix('workon niceproject'):
            run("git pull")
            run("web/manage.py syncdb")
            run("web/manage.py migrate niceproject_api")

You may get an error like

/bin/bash: workon: command not found

That's because some distros, like Ubuntu, do not execute the code in .bashrc if it's not an interactive session, so the virtualenvwrapper commands are not available. To fix that, move the virtualenvwrapper load code from .bashrc to .bash_profile and then it'll work flawless.