Rendering model states when running migrate in Django 1.8 consumes
on the order of 4x-6x more memory than <1.8.

References:
* https://code.djangoproject.com/ticket/24745
* https://code.djangoproject.com/ticket/24743

This is causing failures in Jenkins as the workers run out of memory
and either processes cannot fork or the Out Of Memory Killer
kills a process that is running tests.

Disabling migrations until we do either or both of these:
* Upgrade to Django 1.9 and turn them back on. See EV-92 "Discovery: Upgrade edx-platform to Django 1.9"
* Address TE-1310 "Unit tests should be able to run without migrations"

Meta.

It's just as relevant to unit tests and I wish I had seen it earlier.

Stress the transient nature of this debugging step.

This reverts commit 8402be3b.

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

 common/test/data/xml_dag/static/just_a_test.jpg    | Bin 547 -> 517 bytes
 .../test_microsite/images/background-image.jpg     | Bin 160660 -> 160625 bytes
 .../test_microsite/images/header-logo.png          | Bin 1215 -> 1212 bytes
 docs/en_us/architecture/locator_ubiquity.jpg       | Bin 51876 -> 47455 bytes
 docs/en_us/architecture/presplit.jpg               | Bin 43129 -> 38944 bytes
 docs/en_us/architecture/studio mapping.jpg         | Bin 48247 -> 43786 bytes
 .../enrollment_api/source/_static/homepage-bg.jpg  | Bin 160660 -> 160625 bytes
 docs/en_us/internal/test_pyramid.png               | Bin 24698 -> 17598 bytes
 .../platform_api/source/_static/homepage-bg.jpg    | Bin 160660 -> 160625 bytes
 .../shared/images/Announcement_subscriptions.png   | Bin 43413 -> 15474 bytes
 lms/static/certificates/images/backpack-logo.png   | Bin 2107 -> 1112 bytes
 lms/static/certificates/images/backpack-ui.png     | Bin 76558 -> 54810 bytes
 lms/static/certificates/images/bg-verified.png     | Bin 25152 -> 5169 bytes
 lms/static/certificates/images/demo-sig1.png       | Bin 3852 -> 2099 bytes
 lms/static/certificates/images/demo-sig2.png       | Bin 3695 -> 1990 bytes
 lms/static/certificates/images/demo-sig3.png       | Bin 7315 -> 3721 bytes
 .../certificates/images/demo-user-profile.png      | Bin 61749 -> 40719 bytes
 lms/static/certificates/images/ico-honor.png       | Bin 59443 -> 35743 bytes
 .../certificates/images/ico-mozillaopenbadges.png  | Bin 3638 -> 1870 bytes
 lms/static/certificates/images/ico-verified.png    | Bin 59571 -> 35713 bytes
 lms/static/images/app/google_play_badge_45.png     | Bin 8913 -> 4548 bytes
 lms/static/images/bg-footer-divider.jpg            | Bin 416 -> 390 bytes
 lms/static/images/bg-texture.png                   | Bin 10028 -> 2092 bytes
 lms/static/images/bulk_email/FacebookIcon.png      | Bin 550 -> 333 bytes
 lms/static/images/bulk_email/GooglePlusIcon.png    | Bin 1286 -> 679 bytes
 25 files changed, 0 insertions(+), 0 deletions(-)

Includes info about the serversonly/testsonly pattern, as well
as multiprocessing.

Adding information about paver

JShint will be executed with paver run_jshint, which will use a defined set of
directories (likewise defined are directories to ignore). A limit can be imposed
on the total number of violations. Note that this change does NOT include adding
jshint to diff-quality or `paver run_quality`.

This allows developers to pass the `--pdb` flag to paver test commands,
and that flag will be proxied to the `nosetests` command. It's useful
for debugging purposes.