Ported CSSpendingModel class.
Ported CSSettingsManager class.
Ported the Data/Interface classes.
Added Dropbox framework, ported CSDropboxCategoryRepository.
Ported CSDropboxLabelRepository.
Ported CSDropboxSpendingModelRepository.
Ported CSDropboxRepositoryFactory.
Ported CSDropboxManager.
Merge branch 'feature/dropbox' into develop