Add ability to change opening/closing tag character

[mla]

From @Naturalist:

Hi Stefan!

On Sun, Jul 20, 2014 at 9:00 AM, Stefan Geneshky wrote:
Hey Maurice,

I want to use Text::Forge for a project, and I have a quick question for you:
I need to be able to change the <% and %> tags, so I can have >>JavaScript templates (which use the same tags) in the same file.

The start and end tags are hard-coded in the _parse function. I thought I could add them as >>attributes to the constructor, however it seems that the _parse function itself is invoked via the class >>name, and not with a blessed reference.

Is there are good reason for this? Could I change the _parse function to a method and add >>attributes to customize the start and end tags?

No, no good reason that I can see. And in fact _compile is calling _parse as an instance method >already. So I think we can just rename $class to $self there.

I'd be interested in folding your changes into the module, so let me know what you come up with.

Maurice