Retrieves the dunning deadlines from the settings
Commented and simplified DunningViewModel
bind ViewModelComposer as Singleton
added basic JUnit test
Added dunning deadline settings to sql insert
Methoden für INSERT, UPDATE, DELETE von Collections hinzugefügt.

Automatisches feuern von UpdateEvents ausgestellt.
Added dunning settings to DunningViewModelTest
Changed key of dunning deadline settings
Removed default buttons
Dunning deadlines are added to property settings
Removed unneccessary comments
Merge pull request #725 from jidel/issue#715-primary_buttons

Removed default buttons
Merge pull request #727 from Junkern/#594

#594
add guice module without singletons
ignore test
add base test for views
ignore base test
add test for DunningView
organise imports
use guice modules without singletons