[Fix #73] Improve stacktrace 'tooling' classifier.

Previously this only considered `clojure.lang.Compiler`; now updated to
consider `clojure.tools.nrepl.*`, and walk call stack from top to bottom.

Also, enhance function name demunging.
Ensure `java-info` arguments are symbols.
Merge pull request #77 from jeffvalk/master

[Fix #73] Improve stacktrace 'tooling' classifier.