shoes/shoes4 — pull request #432 by GazCMarsh (2013-09-17 21:34:09+00:00)
Title: First pass at fixing issues identified in #423

Added documentation to manual-en.txt for ```:wedge``` style for ```arc```.

Implemented missing ```:center``` stile for arc.

Couple of things to consider / I was unsure about:

* I patterned the implementation of the ```:center``` style after that implemented for ```oval``` (i.e. the code has been added to ```Shoes::DSL::arc```) - should really move it into a utility function (and then also use it within rect), but am unsure where to put it.
* I haven't worked out how to test the dsl within a spec yet to test ```:center``` - any pointers gratefully accepted :) (Could add a new simple example?)