Remove lettuce tests
Fix missing parens in turbo mode template
Serialize answer dict before calculating size for datadog
Fix typo in self-api datadog metric
Remove an unused query.
Merge pull request #248 from edx/will/fix-turbo-mode-parens

Fix missing parens in turbo mode template
Merge pull request #245 from edx/will/remove-lettuce

Remove lettuce tests
Merge pull request #250 from edx/will/fix-metric-typo

Fix typo in self-api datadog metric
Merge pull request #252 from edx/sanchez/remove_unused_query

Remove an unused query.
Self-assessment not yet started should be unavailable.
Display submission deadline in template, not problem deadline.
Merge pull request #251 from edx/will/date-template-fixes

Date fixes
Merge pull request #249 from edx/will/accurate-answer-size-metric

Serialize answer dict before calculating size for datadog
Updating the peer assessment mixin to allow continued grading at any time
Gracefully handle Studio authors setting invalid problem dates.
Add submission_start attribute to problem definition XML.
Merge pull request #253 from edx/will/relax-date-validation

Gracefully handle Studio authors setting invalid problem dates
Merge pull request #254 from edx/sanchez/TIM-415-Enable-Turbo-Grading

Updating the peer assessment mixin to allow continued grading at any tim...
TIM-435: Prevent whitespace-only submissions
Merge pull request #256 from edx/jrbl/435-no_whitespace_submissions

TIM-435: Prevent whitespace-only submissions
TIM-420: Format default prompts with long lines

* Format the default prompts and options with long lines so that they
  don't look like they have weird wrapping in narrow edit displays.
* Remove some unused UI mockups
* Silence a small number of nitpicky pylint warnings
Merge pull request #257 from edx/jrbl/420-triage-tiny-screens

TIM-420: Format default prompts with long lines