Added Multi-line parsing of functions

This makes the code less robust in that you have to select only function code, but you can do multi-line parsing.

Now you can have something like 
fslsmooth <- function(
  file,
  sigma=10, 
  mask=NULL, 
  outfile=NULL, 
  retimg = FALSE,
  reorient = FALSE,
  intern=TRUE){
	
and will parse to 
#' @export
#' @title <brief desc>
#'
#' @description <full description>
#' @param file <what param does>
#' @param sigma <what param does>
#' @param mask <what param does>
#' @param outfile <what param does>
#' @param retimg <what param does>
#' @param reorient <what param does>
#' @param intern <what param does>
#' @export
#' @keywords
#' @seealso
#' @return
#' @alias
#' @examples \dontrun{
#'
#'}