CLI: inconsistent path filtering

[bzz]

Steps to reproduce:

mkdir -p /tmp/linguist-django
cd /tmp/linguist-django
git clone --depth 1 https://github.com/django/django.git
cd -

./enry /tmp/linguist-django/django/
95.87%	Python
1.85%	JavaScript
1.65%	HTML
0.63%	CSS
0.01%	Shell
0.00%	Smarty
0.00%	Makefile

./enry /tmp/linguist-django/
95.30%	Python
1.83%	JavaScript
1.63%	HTML
0.62%	CSS
0.53%	Roff Manpage
0.04%	Makefile
0.04%	Batchfile
0.01%	Shell
0.00%	Smarty

The difference is in Roff Manpage and Batchfile both under docs/ subdir in Django not being skipped on the second run.

The reason is that current documentation path filtering condition logic is not triggered, as the relative path in second case has prefix and does not match the regexp.

[bzz]

Need to decide if that is expected from the user perspective.

For now, I tend to think that this is a bug.