This commit adds a two new functions of the Result type:

- Result.Path:  Returns the original path of a `Result` that was
                returned from a simple `Get` operation.
- Result.Paths: Returns the original paths of a `Result` that was
                returned from a `Get` operation with a query.

See issue #206 for more details

You can use the '!' character to define static json as a path
component.

For example,

  {name.last,"foo":!"bar"} => {name.last,"foo":"bar"}

see #249

Closes #253

See #248

For wrapping and unwrapping json strings

Added an additional link to the SYNTAX doc. 

#261

The new "@group" modifier allows for grouping arrays of objects.

For example, using the "@group" modifier on the following json...

  {"id":["123","456","789"],"val":[2,1]}

will results in...

  [{"id":"123","val":2},{"id":"456","val":1},{"id":"789"}]

See #264

The only purpose of using the built-in Go was to encode json
strings that had unicode or needed to escaped.

This commit adds the new function `AppendJSONString` which allows
for appending strings as their json representation to a byte
slice.

It's about 2x faster than using json.Marshal.