Fix XBlock SDK checkout

Description

The latest XBlock SDK version (v0.1.4) is compatible with Django 1.11,
but not Django 1.8. Consequently, the `syncdb` command will not work
with v0.1.4. To address this problem in the Open edX documentation, we
choose to stick with the same Django version as Ficus/Ginkgo.

Affected user: https://openedx.slack.com/archives/C0GF6FTHA/p1500890543190218
(I know another faced this problem before, but I can't remember who)

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      1. Date Needed

It would be great if this change was pushed to the official documentation as soon as possible, because XBlock developer currently can't create new XBlocks by following the documentation. The error that they obtain is cryptic ("no such table: workbench_xblockstate").

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      1. Reviewers

Possible roles follow. The PR submitter checks the boxes after each reviewer finishes and gives :+1:.

  • [ ] Subject matter expert: @mhoeber (wrote the rest of the documentation page)

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      1. Testing

  • [x] Ran ./run_tests.sh without warnings or errors

```********** All builds done ************
TOTAL SPHINX ERRORS: 0
TOTAL SPHINX WARNINGS: 8
OTHER BUILD ERRORS: 0
There were problems while building the following projects:
en_us/course_authors
en_us/open_edx_course_authors```

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      1. Post-review

  • [ ] Add a comment with the description of this change or link this PR to the next release notes task.

  • [ ] Squash commits

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Labels

Contributor Name

Régis Behmo

Repo

edx/edx-documentation

Customer

Epic Link

None

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None

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Platform Map Area (Levels 3 & 4)

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