Lime Cheesecake

1 1/4 cups zwieback toast crumbs
2 tablespoons granulated sugar
1/3 cup margarine, melted
1 envelope unflavored gelatine
1/4 cup cold water
1/4 cup lime juice
3 eggs, separated
1/2 cup granulated sugar, divided
1 1/2 teaspoons grated lime peel
16 ounces Neufch