Variable Extrude a OpenScad Library

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##Variable Extrude **About this Library** This is an implementation of linear_extrude, where the scale parameter can also be a function. With the exeption of the scale parameter this works like the built in [linear_extrude](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#linear_extrude)(the v parameter from the snapshot version is not implemented). **Usage** *1. Add to your library* 1. Copy the `variable_extrude.scad` to your scad library folder. 2. add "`use<variable_extrude.scad>;`" in your scad file 3. use `variable_extrude` with same parameter as [linear_extrude](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#linear_extrude) (exept v) *2.How to use the scale paramter* Like the original [linear_extrude](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Using_the_2D_Subsystem#linear_extrude) the scale parameter exepts either a scalar(`single_value`) or a vector(`[x_value,y_value]`). In this implementation the values can either be a number or a function. The function used takes one parameter, wich is the progress of the extrusion (0-1) and returns a number, that is used at that heigth for scaling. The scad file includes one example and the included stl `variable_extrude.stl` is the result(with more slices and higher $fn). If someone involved with the development of OpenScad sees this think about implementing this functionality into the native linear_extrude module. *Note: I if you find a bug write a comment*

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