json attribute casing

[steveoh]

in version ^1.x we introduced a hidden flag to keep attributes cased the same way they are in the data. The camelCase code we use munged data.

I propose we remove the camel case option and introduce

• upper
• lower
• data (make default)

[steveoh]

all attributes are lower in postgres. data doesn't make a ton of sense.

• upper (upper case all output properties)
• lower (lower case all output properties)
• input (set properties to match input request)

These options make the most sense.