In the heydays of parallel cinema in Hindi film industry, a quartet ruled the firmament -- Naseeruddin Shah, Om Puri, Smita Patil and Shabana Azmi. Happy birthday Shabana Azmi: The actor turns 70 today. Daughter of noted Urdu poet Kaifi Azmi and stage actor Shaukat Azmi, it was only natural that Shabana was exposed to arts and a culture early …