v0.3.18, now with better asset management!

I’ve just released v0.3.18, with the following changes:

• Add date grouping properties to entry
• Add a pages property to view
• Provide the current category object to the error handler
• Support linking to non-image/non-entry local files
• Added, then removed, some performance micro-optimizations that only caused problems

More details about the major changes below!

Update: I released a hotfix as 0.3.18.1 because there was a last-minute bug that snuck in while I was trying to silence a new pylint error. Oops.