[Ironruby-core] Code Review: Dir4

[Tomas Matousek]

  tfpt review "/shelveset:Dir4;REDMOND\tomat"
  Comment  : 
  DLR, Python:
  -	Adds more file system APIs to PAL. Obsoletes virtual methods GetFiles and GetDirectories in favor of GetFileSystemEntries. 
  
  Ruby:
  -	Fixes some Dir specs, adds support for Unicode file/directory names. 
  -	Changes Dir and File methods to use PAL for file system operations. Adds Dir tests exercising a custom virtual file system.
  -	Fixes encoding of file paths. This might fix some of the reported System::Text::DecoderFallbackException issues (http://ironruby.codeplex.com/WorkItem/View.aspx?WorkItemId=2931)
  -	Fixes issues with -v command line option.
  -	Fixes bugs in methods using MutableString.GetByteArray.
  -	Fixes MutableString#inspect and dump to handle strings with incomplete UTF16 characters.
  -	Fixes bugs in glob.

Tomas
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