Allow to ignore certain files in squint.edn

[zampino]

For scenarios where clojurescript files live in the same folder of clojure ones, it might be handy to specify in squint.edn which files should be actually processed (i.e. compiled or copied over). Maybe an inclusion or exclusion glob?

All files in :src are currently handled by default.

If I have

{:paths ["src"]
 :output-dir "public/js"}

in my squint.edn, all of clojure source files will be copied over.