IClojure crash on completing functions for namespace with dots

```clojure
user[1]: (require '[clojure.test :as clt])

user[2]: (clt/<TAB>
clt/deftest-                    clt/join-fixtures               clt/*initial-report-counters*   
clt/assert-predicate            clt/testing-contexts-str        clt/deftest                     
clt/*testing-vars*              clt/is                          clt/testing-vars-str            
clt/get-possibly-unbound-var    clt/testing                     clt/use-fixtures                
clt/try-expr                    clt/run-tests                   clt/do-report                   
clt/test-ns                     clt/*test-out*                  clt/report                      
clt/function?                   clt/file-position               clt/test-all-vars               
clt/run-all-tests               clt/*report-counters*           clt/assert-any                  
clt/inc-report-counter          clt/successful?                 clt/compose-fixtures            
clt/test-var                    clt/are                         clt/*load-tests*                
clt/assert-expr                 clt/with-test-out               clt/set-test                    
clt/with-test                   clt/*stack-trace-depth*         clt/*testing-contexts*          
user[2]: (clt/
```

```clojure
user[1]: (require 'clojure.test)

user[2]: (clojure.test/<TAB>;;no newline here in the output
Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: clojure.test
	at clojure.lang.Util.runtimeException(Util.java:165)
	at clojure.lang.RT.classForName(RT.java:2017)
	at clojure.lang.Compiler.maybeResolveIn(Compiler.java:6743)
	at clojure.core$ns_resolve.invoke(core.clj:3879)
	at clojure.core$ns_resolve.invoke(core.clj:3876)
	at clojure.core$resolve.invoke(core.clj:3885)
	at complete$resolve_class.invoke(complete.clj:82)
	at complete$eval284$fn__285.invoke(complete.clj:97)
	at clojure.lang.MultiFn.invoke(MultiFn.java:167)
	at complete$completions.invoke(complete.clj:125)
	at complete$completions.invoke(complete.clj:123)
	at clojure.lang.Var.invoke(Var.java:401)
	at com.offbytwo.iclojure.completion.ClojureCompletionWrapper.getCompletionsForString(ClojureCompletionWrapper.java:32)
	at com.offbytwo.iclojure.completion.DefaultCompleter.complete(DefaultCompleter.java:15)
	at com.offbytwo.iclojure.completion.DelegatingCompleter.complete(DelegatingCompleter.java:65)
	at com.iclojure.jline.console.ConsoleReader.complete(ConsoleReader.java:1581)
	at com.iclojure.jline.console.ConsoleReader.readLine(ConsoleReader.java:1290)
	at com.iclojure.jline.console.ConsoleReader.readLine(ConsoleReader.java:1117)
	at com.offbytwo.iclojure.repl.IClojureRepl.readLine(IClojureRepl.java:326)
	at com.offbytwo.iclojure.repl.IClojureRepl.read(IClojureRepl.java:68)
	at com.offbytwo.iclojure.repl.IClojureRepl.loop(IClojureRepl.java:147)
	at com.offbytwo.iclojure.Main.main(Main.java:63)
Caused by: java.lang.ClassNotFoundException: clojure.test
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:247)
	at clojure.lang.RT.classForName(RT.java:2013)
	... 20 more
```

This is with the fix for #18 included (on rev d3841d87626).