Strengthen resolve-missing

[vemv]

Fixes #335

• Remove slam.hound.future
  • The functions provided by it are expected to be present in all end users' environments.
  • (Especially since rewrite-clj now has a min requirement of Clojure 1.8)
• Multiple fixes for refactor-nrepl.ns.slam.hound.search
  • Handle delay correctly
  • Handle separators correctly for Windows
  • Use a classpath value that will work
  • Filter out more Clojure auto-generated classes
  • Remove 'namespace' finding functionality, we don't use it (as we use all-ns instead) so it was confusing.
• Remove unused code from refactor-nrepl.ns.slam.hound.regrow

[bbatsov]

Good changes overall, but I guess it's time to drop this code structure with the copied slamhound namespaces and just put everything new need under refactor-nrepl.ns or something like this. slamhound is dead and buried at this point and the current code structure is confusing for people not familiar with how we got where we are. A good opportunity to simplify things. Perhaps down the road some of this stuff can go to orchard? We'll see.

[vemv]

Good remark, I think that over time I'll be moving/proposing new functionality to Orchard so that it fulfills its original purpose optimally.

[vemv]

Ready again