Only automatically strip the leading character from a partial if it's a _
Adds a partialsPath option

This option is useful for large codebases that organize partials into a subdirectory of their templates. When used in combination with a lax partialRegex filter, partials inside the specified subdirectory can leave off the leading _ in their filename.
Since the partialsPath example uses partialRegex, the docs for that option should come first.