Bug fixing: storing the correct object id in the Fields object

Bug fixing: Improving error handling in download_dataset method

Changing tests to create resources under a project

Adapting tests to backend changes in text analysis

Adding test file

Bug fixing: create source failed when using unicode arguments

Ensuring unique ordering in MultiVote categorical combinations

Changing last test data for clusters according to backend changes

Bug fixing: changing tests to compare utf-8 encoded binary streams

Changes in doc, license and naming constant