Added a link to the Ethical Humanist Society

I added a link on the Groups page to the Ethical Humanist Society of Chicago (which is actually in Skokie). According to their site, they are “a democratic fellowship and spiritual home for those who seek a rational, compassionate philosophy of life without regard to belief or nonbelief in a supreme being.” The Chicago Branch of the Center For Inquiry will have their February lecture there on February 28.