Make Template.template public

[Robuske]

Hello, first of all, thank you for all your work on this library.

Apart from that, the title says it all, would be nice to be able to use Template values for raw formatting/parsing. I thought about making a micro PR, but I feared there was a reason for it not being public, besides it's a change so small that you could make trough Github edit.

P.S.: Am I missing something or is it not possible to parse a date with the format y-MM-dd without using the rawFormat? I thought that using the iso8601 Calendar would work, but it does not seem to be the case.