added doc/risk_score_references.txt
completed risk factor full references
fixed spelling in references
added protected methods to RiskScore.java
made labels into values in strings.xml
converted some inline text to strings in strings.xml.
made Reference as string in strings.xml.  Changed OESIL score results to strings from doubles, to avoid displaying percentages with decimal points
removed extraneous periods in SF rule result
added to be completed methods to risk score subclasses
implemented successfully CHADS score
fixed all statements of type getString(string.x, this) to proper getString(R.string.x)
added Toast to show result copied to clipboard