Install the program and put links in place.

def install(self, pip_args=None):
        """Install the program and put links in place."""
        if path.isdir(self.env):
            print_pretty("<FG_RED>This seems to already be installed.<END>")
        else:
            print_pretty("<FG_BLUE>Creating environment {}...<END>\n".format(self.env))
            self.create_env()
            self.install_program(pip_args)
            self.create_links()