adding <name>_options for select_list accessor for list of available select options

Hi,
I added an additional generated method for select_list, <name>_options.  It returns the list of available options to pick from for this select_list. 

I find that when writing my specs I frequently have to verify the options to choose from meets the requirements. Like states select list have all 50 states. 

Let me know what you think. 

Thanks