converts gradebooks/student_attendance js_block into js_bundle

test plan:
* make an assignment
* view the assignment (ex: /courses/1/assignments/97)
* open up the console (script/console)
* run the following commands
* a = Assignment.last
* a.submission_types = "attendance"
* a.save
* now refresh the assignment in the browser
* verify that the assignment now shows an attendance assignment

Change-Id: I81d904ad874bb4a854433bcc17d2d71aad871670
Reviewed-on: https://gerrit.instructure.com/29142
QA-Review: Landon Wilkins <lwilkins@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Product-Review: Landon Wilkins <lwilkins@instructure.com>