Bump version
Switch to root parameter files
Fix version
Update grammar versions
Update changelog
Set alpha back to 1 for Questions button if active
Add todo
STATUS_UPLOADED_AND_KEEP is also completed for questionnaires
Merge branch 'release/0.18'
Merge tag '0.18' into develop

* Enhancements
  * [#174] Add a MatrixChoiceQuestion type (not yet themed properly)
  * [#94] Start the results page (next is #173)
  * [#106] Set up APK signing for future release
  * [#182] Show an introduction text in all questions
  * Add a questionnaire management screen and button to dashboard
  * [#191] Add an auto-complete list type question (not yet themed properly)
* Bug fixes
  * [#149, #188, #208] Design issues in MultipleChoiceQuestion
  * [#148] Design issue in SliderQuestion
  * [#185] Too much vertical space in questions
  * [#195] Only ask about bonus questions once in sequence, and skip all or take all
  * [#206] Design issues in Consent activity
  * [#204, #207, #209] Design issues in Terms, About, Profile activities