Allow editing of MentorTerms

As the default scope of a MentorTerm involves a join, Rails automatically
marks any returned records as read only so that columns in other tables
aren't accidentally changed. We override the default as all MentorTerm
operations are safe in this regard.
Fix Web Service Connection
Bind event handler to ajax loaded mentor onboarding form
Sort mentors by lastname on onboarding page

We use a ruby sort rather than a SQL sort as mentors can only be inferred
through MentorTermGroups, and the complexity of the joins needed outweighs
the negligible performance impact
Merge pull request #84 from uwdreamproject/uwdp-develop

Dream Project important bug fixes