Use non-exception version of stat -- this seems to be working for me (dfr originally did this but something was broken)
Update to snapshot of jnr-posix until we release it
Short-circuit jar resources if they do not start with first letter of their supported schemes -- improves startup time
Remove old file: removal code in RubyFile. Change JarResource to fast check for '\!' since non-scheme paths an be jar resources.  fast path check against ':' for scheme-oriented resource types.  10+% speedup on simple rails launch
Missed removing this no longer used bytelist from last commit
Reduce Dir by one resource creation and make entries avoid extra boxing of entries