cljr add require to ns

ar Add require to namespace declaration

Adds a (:require ) clause to to the namespace declaration if necessary, then gives you several tabstops to help you write your require statement:

• 1st tabstop wraps the entire [example :as x] entry, letting you paste in a complete require.
• 2nd tabstop is inside the brackets example :as x, letting you write in a require with no alias.
• 3rd and 4th tabstop is the example and x, letting you write a require with an alias.

Once you're through the tabstops, the cursor jumps back to where you were. If cljr-auto-clean-ns is true (the default), the namespace is cleaned up afterwards.