Introduced IRepository.
Renamed some varaibles.
Removed IArticleRepository but instead, used IRepository<Article>.
Removed IArticleWordRepository.
Removed some unncessary members.
Addressed some code-analysis errors.
Addressed deleting log files before starting the test.
Addressed style-cop error.
Merge pull request #16 from jwChung/common-repository-interface

Common IRepository interface.