Allow setting the default blacklist via properties

[codeconsole]

If properties are not set, default behavior remains unchanged.

Example:

grails:
  plugin:
    fields:
      exclusions:
        display:
          - version
          - created
        input:
          - version
          - lastUpdated
          - dateCreated
          - created
          - modified
        list:
          - version
          - modified

[jdaugherty]

This looks like it would work, but I'd like to see some tests for the exclusion loads.

[codeconsole]

This looks like it would work, but I'd like to see some tests for the exclusion loads.

@jdaugherty done