Add a convenience method to obtain a mentor choices to be rendered for assign mentor form.
Add a convenience method to obtain a mentor choices to be rendered for assign mentor form.

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extra : rebase_source : 85daf7d137d106a7b96443af0add0a239a898351

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