Adds moving sine graph to active breath graph.
Makes clearRect get called unconditionally in loop, now that a sine wave is being drawn continuously.
Slows down the reference breath a bit.
Adds simple checkbox to determine whether sine graph appears.
Makes reference graph disappear if there is no new activity, just like user-generated graph.
Merge pull request #18 from rgabrielsson/master

update sine_experiment with latest changes from master
Added render function for guidance. Updated interface between breathGraph and controller. Added styling to guidance toggle button. Made the guidance graph start when user starts. Changed guidance amplitude to match breath graph.
Added render function for guidance. Updated interface between breathGraph and controller. Added styling to guidance toggle button. Made the guidance graph start when user starts. Changed guidance amplitude to match breath graph.
Merge branch 'sine_experiment' of https://github.com/rgabrielsson/MobileMindfulness into sine_experiment
Merge pull request #17 from rgabrielsson/sine_experiment

Sine experiment -- adds moving reference graph on /guidance url