R Programming Assignment 2

## makeCacheMatrix
# creates a matrix object to cache the inverse of a matrix
## cacheSolve
# computes the inverse of a matrix returned by makeCacheMatrix
# if the inverse has already been calculated then it retrieves
# the inverse from the cache
## Example of use
# > xMat[1,1]<-2
# > x <- makeCacheMatrix(xMat)
# > cacheSolve(x)
# > x$getInverse()