added a legal-notification regarding prizes to the tech-screen (due to apples app-rejection)
added a new challengeEnginge which fixes a problem with optional conditions and fail-feedback items
cleaned javascript
<cleanup/refactoring> removed some unused code, marked some problematic areas
changed default project back to android
<DA-406> Merge branch 'unstable' into DA-406
<unstable> Merge branch 'DA-406' into unstable
removed alert. There seems to be still a JS bug
<unstable> Merge branch 'cleanup/refactoring' into unstable

* cleanup/refactoring:
  <cleanup/refactoring> removed some unused code, marked some problematic areas
<DA-429> (iOS) set highlighting to false when challenge is cancelled
<unstable> Merge branch 'DA-429' into unstable

* DA-429:
  <DA-429> (iOS) set highlighting to false when challenge is cancelled
<refactoring> fix possible problems with Login/Profile fragments
<unstable> Merge branch 'refactoring' into unstable

* refactoring:
  <refactoring> fix possible problems with Login/Profile fragments
<DA-406> add sharing confirmation