Study name shown with /studies is wrong

Also rename name field to id one in Study
Study name shown with /studies is wrong

Also rename name field to id one in Study
Merge branch 'issues/study-name-is-wrong' of github.com:thehyve/transmart-rest-api into issues/study-name-is-wrong
Modify API documentation

- studyName -> studyId
- rename file to README.md so it'll be displayed in first page of github
Get id from study insted of term name
Merge pull request #26 from thehyve/issues/study-name-is-wrong

Study name shown with /studies is wrong