Expose format helper methods for developers

[ericf]

What's the reasoning behind exposing these?

[apipkin]

The idea behind these format helper methods is to add the ability to take something like

{{intlDate NOW_DATE month="numeric" day="numeric" year="2-digit" hour="numeric" minute="numeric"}}

to something like

{{intlDate NOW_DATE format="medium" }}

This was the option rather than including only a few format options within the code itself. These methods have been approved for a while, but were never exposed to actually be used.

[caridy]

I'm ok with exposing them.

[apipkin]

If they aren't exposed, they should be removed from the the library as they wouldn't be useful to any one. As well as the calls to check if options.hash.format is stored anywhere.

[caridy]

+1 after docs landed.