Version bump to 1.8.0
Version bump to 1.8.0

ale7714/premailer,r-shah/java-premailer-wrapper,ale7714/premailer,academia-edu/premailer,danimashu/premailer,constantcontact/premailer,r-shah/java-premailer-wrapper,Guestfolio/premailer,PrecisionNutrition/premailer,Guestfolio/premailer,constantcontact/premailer,thebeansgroup/premailer,PrecisionNutrition/premailer,danimashu/premailer,thebeansgroup/premailer,r-shah/java-premailer-wrapper,will-in-wi/premailer,will-in-wi/premailer,academia-edu/premailer