Rename "Associated*" to "Assoc*"
Rename "Associated*" to "Assoc*"

modify pretty.rs which recently added "Associated*"

graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust