This reverts commit 9967b6fd.

We're seeing errors in NR from objects read out of the cache lacking the
'StaticContent' object has no attribute 'content_digest'
File "/edx/app/edxapp/edx-platform/common/djangoapps/contentserver/middleware.py",
    line 70, in process_request

This reverts commit 849ebc5f.

This reverts commit 8402be3b.

Ran these suckers through ImageOptim, which crunched 'em down real nice.

 .../js/vendor/ova/images/previous_pressed.png      | Bin 755 -> 665 bytes
 .../static/js/vendor/ova/images/previous_rest.png  | Bin 661 -> 572 bytes
 .../js/vendor/ova/images/zoomin_grouphover.png     | Bin 612 -> 496 bytes
 .../static/js/vendor/ova/images/zoomin_hover.png   | Bin 608 -> 506 bytes
 .../static/js/vendor/ova/images/zoomin_pressed.png | Bin 615 -> 515 bytes
 common/static/js/vendor/ova/images/zoomin_rest.png | Bin 612 -> 496 bytes
 .../js/vendor/ova/images/zoomout_grouphover.png    | Bin 504 -> 397 bytes
 .../static/js/vendor/ova/images/zoomout_hover.png  | Bin 559 -> 461 bytes
 .../js/vendor/ova/images/zoomout_pressed.png       | Bin 561 -> 458 bytes
 .../static/js/vendor/ova/images/zoomout_rest.png   | Bin 504 -> 397 bytes
 common/test/data/aside/static/just_a_test.jpg      | Bin 547 -> 517 bytes
 common/test/data/badges/good.png                   | Bin 298 -> 91 bytes
 common/test/data/badges/large.png                  | Bin 431556 -> 429842 bytes
 common/test/data/badges/unbalanced.png             | Bin 232 -> 86 bytes
 .../static/images/course_image.jpg                 | Bin 12626 -> 12617 bytes
 .../static/images/professor-sandel.jpg             | Bin 453715 -> 447109 bytes
 .../Screen Shot 2013-04-16 at 1.43.36 PM.png       | Bin 8733 -> 1525 bytes
 .../data/simple/static/images_course_image.jpg     | Bin 547 -> 517 bytes
 common/test/data/static/picture1.jpg               | Bin 10905 -> 6857 bytes
 common/test/data/static/picture2.jpg               | Bin 13598 -> 9739 bytes
 common/test/data/static/picture3.jpg               | Bin 14977 -> 9946 bytes
 common/test/data/toy/static/just_a_test.jpg        | Bin 547 -> 517 bytes
 common/test/data/uploads/Signature-0.png           | Bin 31182 -> 14473 bytes
 common/test/data/uploads/Signature-1.png           | Bin 31182 -> 14473 bytes
 common/test/data/uploads/larger_image.jpg          | Bin 1070335 -> 1053927 bytes
 25 files changed, 0 insertions(+), 0 deletions(-)

This changes logic to allow more missed use cases of course_image to
work properly.  The cases are:

. XML courses with the course_image attribute set
. Mongo courses that are imported without a contentstore
. Mongo courses that have course_image set but don't have a content store

It also exports default images_static_course.jpg to
images/static_course.jpg to handle a use case where a course author
uploaded an image to the default location in studio without using the
studio interface for adding course images, they then export the course, and then
import it without a contentstore

STUD-878

Factories were used when possible but tests depending on importing or things not manageable by factories used the toy course.  New files were added to include the needed functionality.  Most files are blank or have minimal xml needed to work

A blank asset file was also added to toy