Add support to render Other checkbox for radio, checkbox and select type of fields.
Add support to render Other checkbox for radio, checkbox and select type of fields.

We pass this information from the field that reads the current state from the
existing field meta data if it is recreating the data to all the way down to
the functions that render the other radio field.

We also provide customization for message to be displayed for the Other field.

--HG--
extra : rebase_source : 22326c0284052225a0d9dd746a053d3b60e25886

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son