Changed session_id to data_set_id in media_objects.yml.Added tests in all unit files for the hidden field. Refractored all unit test code. Removed all experiment files including experiments.yml, experiment_templates_controller_test.rb, experiments_controller_test.rb, and experiment_test.rb. Also, renamed data_set.rb to data_set_test.rb.
Merge branch 'master' of git://github.com/isenseDev/rSENSE into testing2
Merge pull request #329 from kcarcia/testing2

Syntax error fixed, renamed files, added new tests, and refractored code