hugo: Periods generating bad paths

This issue is similar to #1188. If the permalink uses the title of the post and the title has a period in it, it generates some weird paths.

I expect title: testdot. to create testdot/index.html instead I get testdot/index. I experimented with a few different variations and they all give me weird results. title: test.dot -> test/index.dot title: .testdot -> /index.testdot (no folder)

The same thing seems to happen if using slug or filename in the permalink. If you have two, like :slug/:title it’ll do the first fine but the end will still be wrong, making slug & title: test.dot generate test.dot/test/index.dot. Strangely enough it doesn’t happen if I make a section called test.dot and set the permalink to :section. I’ve also tried with a few other symbols, but they all seem to work just fine.