Ability to not fold function names and docstrings

[siddarthio]

I wanted the ability to see function names not be incorporated into the fold, similar to (Issue: folds the function names too? #108) and also I saw that a lot of people wanted the ability to stop Docstrings from being folded (Issue: Option to start definition fold after docstring #84). So I added both of those.

I just started using Vim about a week ago, so I wasn't able to find out how to change the default value of the variables to 0. I think that this should be done, otherwise when people run PlugUpdate or its equivalent, they will need to change their .vimrc.

Thanks for Plugin btw, I absolutely love it, It's way better than the shitty folding that Atom had.

[enriquetasa]

Fantastic plugin to use, this feature is something I would appreciate. Thanks.