rfc3339: CHICKEN 6 support

[Mario Domenech Goulart]

Hi Jim,

The attached patch adds support for CHICKEN 6 to the rfc3339 egg.  It
breaks support for CHICKEN versions < 5.2.0, though.  In case you see
that as an issue, please let me know and I'll create a more portable
version of the patch.

I also volunteer to tag a new release, if that's more convenient to you.
Here I don't know how you want to proceed, though.  There are basically
two options:

1. Keep the CHICKEN 5 code unmodified and make new modifications to the
   code for CHICKEN 6 only (this would be like a fork of the egg).  The
   version of the egg for different versions of CHICKEN will most likely
   be different.

2. Use identical egg code for both CHICKEN 5 and CHICKEN 6.  In this
   case it would make sense to have the same egg versions for both
   versions of CHICKEN.

Your call.

rfc3339 is a dependency of salmonella-feeds, and I'm in the process of
porting the salmonella tools to CHICKEN 6.

All the best.
Mario
-- 
http://parenteses.org/mario

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