DASpringate

#' R implementation of `cond` from Lisp
#' allows for arbitrary numbers of conditionals without ugly nested if statements
#' conditionals are entered as pairs of expressions (clauses), 
#' first the expression to be evaluated and second the return value if the expression is true
#' @param ... an even number of expressions as pairs (see example)
#' @param true the `else` expression (Taken from the Lisp (T resultN) see http://www.cis.upenn.edu/~matuszek/LispText/lisp-cond.html)
#' @return The paired value of the first true conditional expression or the value of true
#' @examples
#' x <- runif(1)
#' cond(x < 0.2, "lower tail",