The main improvement is that this version now expands wildcards in command-line arguments.
This is useful because cmd.exe and PowerShell, contrary to Unix shells, don't expand wildcards.
Ex: ag greer src\*.h

Other changes:

• Merged in the latest updates from Geoff Greer's master version.
• Convert path separators in error messages back to a \.
• Display a more detailed version for the Windows port with option -V.