Lecture Notes:
	* Added lecture notes for Week 3
	  - Covers fcns: lapply, apply, sapply, tapply, mapply
	  - Does NOT include Debugging
	* Added lecture Notes for Week 4
	  - The str() fcn
	  - Notes on simulation and the R Profiler

best.R
	* Takes data from the Hospital Compare site (http://hospitalcompare.hhs.gov) but the US Dept of Health and Human Services
	* Takes a state and an "outcome" (heart attack, heart failure, or pneumonia) as input
	* Returns the name of the hospital with the LOWEST 30-day Mortality Rate for that outcome in that state
	* If state or outcome inputs are invalid, fcn stops and says which input is invalid

rankhospital.R
	* Data from Hospital Compare site (US Dept of Human and Health Services)
	* Takes a state, an outcome, and a rank (num) that can be a number, "best", or "worst
	* Returns a character vector with the name of the hospital with the num rank of outcome in the specified state
	  - ex: rankhospital("TX", "heart failure", 4) will find the hospital ranked 4th best in lowest mortality rates due to heart failure in Texas.
	  - [1] "DETAR HOSPITAL NAVARRO"
	* Checks validity of args; stops script and displays message showing which input is invalid