Don't unescape escaped data for unminified content.

When content is put inside of tags that are to be excluded from the build, they generally want that content unmodified. I think the most common case for this is code blocks. Even if it's not the most common, it's definitely a very common case.

Escaping this data can cause many issues, especially if an xml or html code block was provided in that block. I can't imagine it's a good idea to ever blindly unescape data.

This resolves issue #55.