Code Review: RubyLibTweaks1

tfpt review /shelveset:RubyLibTweaks1;REDMOND\curth

Implemented minor changes for library support:
Very basic Dir.glob (just enough for Rails test case)
Enumerable::Enumerator
Fcntl constants
Thread.current

Added temporary code to loader to report modules as loaded if built into
IronRuby but external to Matz