File.file?( "uri:classloader:/path/") can be true which is wrong 

```
java -jar jruby-complete.jar -e 'p File.file?("uri:classloader:/META-INF/jruby.home/")'
true
```

which is clearly directory and not a file. and

```
java -jar jruby-complete.jar -e 'p File.file?("uri:classloader:/META-INF/jruby.home")'
false
```
