func NewParsingMap() *ParsingMap {
	return &ParsingMap{}
}
NewParsingMap create a new parsing map and returns a pointer to
be able to call Add directly.
package httpreq
import (
	"errors"
	"strconv"
	"strings"
	"time"
)
var (
	ErrWrongType = errors.New("wrong type for the given convertion function")
)
type ParsingMapElem struct {
	Field string
	Fct   func(string, interface{}) error
	Dest  interface{}
}
type ParsingMap []ParsingMapElem
type Getter interface {
	Get(string) string
}