JSON Pointers array indexes used in restler are not compliant with RFC 6901

[Marcondiro]

Description

Restler exploits JSON pointers in OAS files in the Link objects and in the custom annotations, but the examples and the parsing seem to use a different syntax with respect to the one defined in the RFC 6901. In particular the array indexes are surrounded by square brackets while the RFC doesn't allow them.

o If the currently referenced value is a JSON array, the reference token MUST contain either:

  *  characters comprised of digits (see ABNF below; note that
     leading zeros are not allowed) that represent an unsigned
     base-10 integer value, making the new referenced value the
     array element with the zero-based index identified by the
     token, or

  *  exactly the single character "-", making the new referenced
     value the (nonexistent) member after the last array element.

The ABNF syntax for array indices is:

array-index = %x30 / ( %x31-39 *(%x30-39) ) ; "0", or digits without a leading "0"

Steps to reproduce

Compile an OpenAPI spec having a link like this

          links:
            fooLink:
              operationId: operation1
              parameters:
                foo: $response.body#/0/bar

It will be ignored by restler.

While a (non-standard) link like this will be used by restler:

          links:
            fooLink:
              operationId: operation1
              parameters:
                foo: $response.body#/[0]/bar