More javascript
- Code for getting image paths in photo.js
- Code for manipulating joy entries in joy.js
- Code for saving and changes settings in settings.js
- Polishing and comments in data.js
- index.html is mostly just adding in new JS files
	modified:   data.js
	modified:   index.html
	new file:   joy.js
	modified:   joyapp.js
	modified:   photo.js
	new file:   settings.js