Fix some IE issues that resulted in JavaScript errors

- Internet Explorer does not recognize custom tags until they are manually
  created using document.createElement()
- Iterating over an object's elements resulted in method names being
  included in the key set where the filter was expecting property names
  only
Fix navigation bar

Make the navigation bar work on both IE and other browsers
#132 introduce twigs hotkeys
#132 updated info popup
#132 arrow and enter navigation in usecase- and scenario table
#132 added navigatorTable docu. fixed unit tests
Merge remote-tracking branch 'origin/develop' into develop
moved scenarioo-api to separate respository

see https://github.com/scenarioo/scenarioo-java
#150 moved scenarioo-api to separate respository

see https://github.com/scenarioo/scenarioo-java
Merge branch 'develop' of https://github.com/scenarioo/scenarioo into develop
#150 bumped version to 0.1.21-SNAPSHOT
upped the gradle version
#153 default value for application name and description
#127 Another typo
Replaced ngUSD with Scenarioo
Replaced remaining occurrences of ngusd with sc.
#141 Do not make metadata section titles human readable.
fixes unit test
twigs renamed globalHotkeys functions. fix this
Better toString method.