Created a new User, Experiment, and ExperimentSession and tested that all the default fields were set to their correct defaulted values. Additionally, I created an experiment, experiment session, and user fixture and tested that the fields in the fixtures were correctly set.
Modified fixture files to include valid data for testing for experiments, experiment sessions, and users.
Merge branch 'master' of git://github.com/isenseDev/rSENSE into testing

Conflicts:
	test/unit/data_set.rb
Merge branch 'master' of git://github.com/isenseDev/rSENSE into testing
Merge branch 'master' of git://github.com/isenseDev/rSENSE into testing
Changed the name of experiment_sessions.yml to data_sets.yml. Additionally, data_set.rb now contains the correct tests.  All tests are now using data_sets - this file was using experiment_sessions before my edits.  Created experiment_test.rb and user_test.rb files.
Merge pull request #168 from kcarcia/testing

Unit testing for User, Experiment, and Experiment_sessions: Validation of default fields and creation of fixtures