Graph appearance and some code refactoring:

-Took away points on refernce lines
-Increased size of points on child's line
-Changed colors
-Refactored referene line code
-Removed old attempts to change point size
Repositioned the key, but have not tested it on multiple devices.
Changed date display on graph view, got rid of number z scores and put verbal ones instead.
Merge pull request #4 from achavez812/visualtweaks

Visualtweaks