Required setting, FLUENT_PAGES_TEMPLATE_DIR, not mentioned in README.rst

[mrmachine]

The FLUENT_PAGES_TEMPLATE_DIR is a required setting. Even though it defaults to TEMPLATE_DIRS[0], Django's default settings.py doesn't provide a TEMPLATE_DIR setting.

It also seems a bit arbitrary to nominate the first TEMPLATE_DIRS directory as the only location where fluent-pages templates can be found. Who knows what people have in TEMPLATE_DIRS or what order it is. The order doesn't matter for Django, so fluent-pages shouldn't rely on it.

How about providing a custom template loader, based on Django's app_directories loader, that looks in the fluent_page_templates directory for all installed apps, and use the FLUENT_PAGES_TEMPLATE_DIR (or DIRS) setting to add project level directories that are searched before the app directories?

And also mention in the instructions that the custom app loader should be installed :)