Patch: standalone compiler (2nd try)

[Stuart Sierra]

Patch attached. This uses clojure.core/compile. But it still doesn't
work. I get the same error Stephen reported:

[java] java.lang.IllegalStateException: Var null/null is unbound.
(core.clj:21)
[java] at
org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194)
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:747)
...
[java] Caused by: java.lang.IllegalStateException: Var null/null
is unbound. (core.clj:21)
[java] at clojure.lang.Compiler.analyzeSeq(Compiler.java:4067)
[java] at clojure.lang.Compiler.analyze(Compiler.java:3896)
...
[java] Caused by: java.lang.IllegalStateException: Var null/null
is unbound.
[java] at clojure.lang.Var.get(Var.java:129)
[java] at clojure.lang.Compiler$FnExpr.parse(Compiler.java:2947)
[java] at clojure.lang.Compiler.analyzeSeq(Compiler.java:4058)
[java] ... 42 more
[java] --- Nested Exception ---
[java] java.lang.IllegalStateException: Var null/null is unbound.
(core.clj:21)
[java] at clojure.lang.Compiler.analyzeSeq(Compiler.java:4067)
[java] at clojure.lang.Compiler.analyze(Compiler.java:3896)
...
[java] Caused by: java.lang.IllegalStateException: Var null/null
is unbound.
[java] at clojure.lang.Var.get(Var.java:129)
[java] at clojure.lang.Compiler$FnExpr.parse(Compiler.java:2947)
[java] at clojure.lang.Compiler.analyzeSeq(Compiler.java:4058)
[java] ... 42 more

-Stuart Sierra