Escape student answers in FIMB questions

Closes CNVS-10154

Test plan
---- ----

  - create a quiz with a FIMB question and take it
  - fill in some answers with single-apostrophes in them (ie: foo'bar)
  - refresh the take-quiz page
  - verify that the answers are still there

Also, you can see the screencast attached to the ticket for info on
reproducing the issue.

Change-Id: I3196860866dfc586b400b241c89421b5ca16ec00
Reviewed-on: https://gerrit.instructure.com/29565
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Derek DeVries <ddevries@instructure.com>
QA-Review: Myller de Araujo <myller@instructure.com>
Product-Review: Ahmad Amireh <ahmad@instructure.com>