cljr add missing libspec
cljr-add-missing-libspec will try to resolve the symbol at point and
:require ,,, :as ,,,, :require ,,, :refer ,,, or :import the missing symbol. If the symbol at point is unique on the classpath, the namespace is updated without user intervention, otherwise the user is prompted to select among possible candidates.
If the symbol at point is of the form edn/read-string the required
namespace will be aliased to edn.
