started implementation of some windows
*.vb added to gitignore
better exception handling
added an implementation for ClipboardContentChangeListener
added new test class
added some JavaDoc
implemented working view for vocabulary box
first tries to design windows with a GUI builder
VocabularyBox stores the backside of cards now
added javadoc and changed some names
Merge branch 'master' of https://github.com/sebrockm/LearningByNeeding