TOML and YAML handles integers differently, creating issues when using integer values from configuration or front matter in the First template function.
This currently works in YAML (parses into int), but not in TOML (parses into int64).
This commit modifies First so it accepts any int.
Fixes#551
The Intersect template-method would fail if one or both of the lists were nil (post vs page; post has tags, page has not).
This commit adds a nil-check and returns an empty result if any of the inputs are nil.
See #537
It started with wanting to move templates in template bundles and the
rest followed. I did my best to start grouping related functions
together, but there are some that I missed. There is also the method
Urlize that seems to be a special function used in both worlds. I'll
need to revisit this method.
