Change "whole"/"part" wording in assoc defs (#67).

BREAKING CHANGES

4 Association Definition properties are renamed:
    - whole_type_uri        -> parent_type_uri
    - part_type_uri         -> child_type_uri
    - whole_cardinality_uri -> parent_cardinality_uri
    - part_cardinality_uri  -> child_cardinality_uri

This affects 3 aspects:
    1) Defining Association Definitions in declarative migrations (JSON).
    2) Accessing Association Definition properties at client-side (JavaScript).
    3) Serializing and parsing Association Definition at server-side (Java).

To adapt your plugins a search/replace should do.
But be careful to not catch other things like local JavaScript variables.

See ticket 67.