* will no longer instance_eval/exec each on each element
* all build execution will now run in the scope of the workbook
* or, if using a builder style approach, the scope of the caller
* this means the workbook will store reference collections and provide an api for adding to and referencing them

* style objects are created, stored, and referenced from the workbook scope
* style directives no longer defined in the scope of the style obj
* workbook proxies style obj directives

* elements are created to validate and store data
* these are then passed to the writer who is responsible for using the data as it sees fit
* all element creation is done in the scope of the workbook

* mixins, partials, templates, and styles all build in a consistant manner with the new api changes

Conflicts:
	Gemfile.lock

* using the builder render approach
* using the updated Xmlss API that is Osheet compatible

* adding in to_s, to_data, and to_file workbook meths
* removing all view handler stuff (addresses #17)
* getting name, colspan, rowspan attribute setting hooked up
* updating the examples to run on the new API