Provide a sorted operator

[cdent]

This sorts (using python sorted) the current object's value if it is a
list or dict and returns the list or keys.

This is presented a strawman proposal for doing sorts as I couldn't
decide how to do it correctly. At least with some starting code maybe
we can reach something better.

Note that the goal here is to get a sorted list of atomic entities
which can be evalauted, not to sort a collection of objects by a key
of those objects. That would be useful too, and presumably there is a
way to do it generically.

The demonstrated syntax is:

foo.sorted

presumably things like like:

foo.[/] # ascending sort of this
foo.[] # descending sort of this
foo.[/somekey] # ascending sort by somekey's value

ought to be possible but I do not know if it is aligned with proper
JSONPath.

[cdent]

I don't expect this to be merged, it's just a bit of code to help think about sorting as discussed in #7 and #8. With some assistance I should be able to get us to something that works and is appropriate.

[kennknowles]

You know, I actually prefer this to the JSONQuery syntax.