Update stimfunction to warn on non-critical issues with tests
Implement TR sampling in specifydesign
Implement physiological noise with smoke tests
Implement task-related noise with tests
Merge branch 'implement-noise'

* implement-noise:
  Implement task-related noise with tests
  Implement physiological noise with smoke tests
  Implement TR sampling in specifydesign
  Update stimfunction to warn on non-critical issues with tests