Merge tag '0.30.0' into develop

* Enhancements
  * Upgrade to API 21
  * [#394] Add information popup to evening questionnaire's manySliders question the first time it's opened
  * [#395] Add information popup to glossary the first time it's opened
  * [#393] Switch to parameter's grammar v3.2, allowing "alreadyValid" field for sliders, starRatings, and manySliders
* Bug fixes
  * [#384] Fix thread bugs in WebView on Android 4.4+
  * [#385] Silently log errors when dismissing progress dialogs in hope of obtaining better debug information
  * [#391] Fix clickability of choices in matrixQuestion
  * [#400] Fix JavaScript object injection for ResultsActivity on API >= 17
Delays are in milliseconds, this fixes #407
Readability
Merge pull request #408 from daydreaming-experiment/feature/issue-407-morning-poll-repeated

Issue 407 morning poll repeated
Fix bad-thread crash
Comment out data-erase stuff until really implemented
Bump version
Update grammar versions
Update changelog
Update test list
Merge branch 'release/0.31.0'