code: function defaultTo () {
    var values = R.append('', R.dropLast(1, arguments));
    return R.head(R.reject(R.isNil, values));
  }
docs: Output the first provided value that exists, or fallback to a default if
  none do.
  
  @since v0.0.1
  @param {...*} value
  @return {String}
  @example
  var doesExist = 'Hello';
  
  {{defaultTo doesExist "Goodbye"}} // => "Hello"
  {{defaultTo doesNotExist "Goodbye"}} // => "Goodbye"
  {{defaultTo doesNotExist}} // => ""
  {{defaultTo doesNotExist doesExist "Goodbye"}} // => "Hello"