Relative Path Support

[BradKML]

Because of issues like the following #56
It would be useful to have support for relative paths, especially when the code is used in Jupyter Notebooks for maximum compatibility.

Right now I kind of hack it with this solution:

import os # borrowed from https://stackoverflow.com/a/14125914
relative_path = r'book_test'
current_directory = os.getcwd()
final_directory = os.path.join(current_directory, relative_path)
if not os.path.exists(final_directory): os.makedirs(final_directory)

website = 'https://www.nateliason.com/notes' # or whatever target
from pywebcopy import save_website
save_website(website, project_folder=final_directory)

Some notes: can only get a single page instead of the whole website.