Merge pull request #20 from lc-petranussdorfer/issue/#8

refactored | make it run | fixing bugs
fixing #21
Merge pull request #22 from lc-petranussdorfer/issue/#21

fixing #21
fixed issue#23

disable submit button if there is no model answer
fixed issue#23
Merge pull request #24 from lc-petranussdorfer/issue/#23

fixed issue#23
code improved issue/#25
Merge pull request #28 from lc-petranussdorfer/issue/#25

code improved issue/#25
fixed issue/#30

Added json attributes and updated example.json
Merge pull request #31 from lc-petranussdorfer/issue/#30

fixed issue/#30
bug fixing

Edit example.json and remove buggy push notification when back button is
clicked
Triggered Navigate Back Event
Added a schema
Fixed formatting and type errors
Merge pull request #3 from LearningPool/addSchema

Add schema