Stanford-Online/class2go — pull request #1723 by jbau (2013-01-07 23:50:06+00:00)
Title: adding <preamble> and <postamble> to import xml

@wescott can you take a look. This is useful for DB class, since their interactive exercises have "preambles" that should be displayed for each question, and we're displaying the exercises one-question-at-a-time.