[TxMt] diff statistics off by one

[Grant Hollingworth]

The 'Statistics (Lines Added/Removed)' command in the Diff bundle works by counting + and - characters in the first column.  The current count includes the '---' and '+++' that unified diffs have in the first two lines.

The fix is to skip the first two lines.
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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>beforeRunningCommand</key>
	<string>nop</string>
	<key>bundleUUID</key>
	<string>C2D2BFF9-708D-11D9-BD09-0011242E4184</string>
	<key>command</key>
	<string>tail -n +3 | tee >(add=$(grep ^+|wc -l);  echo 1>&2 "Lines Added   $add") \
   |{ rem=$(grep ^-|wc -l); wait; echo "Lines Removed $rem"; }</string>
	<key>input</key>
	<string>document</string>
	<key>keyEquivalent</key>
	<string>^N</string>
	<key>name</key>
	<string>Statistics (Lines Added/Removed)</string>
	<key>output</key>
	<string>showAsTooltip</string>
	<key>scope</key>
	<string>source.diff</string>
	<key>uuid</key>
	<string>B9091553-4317-415E-B381-4609BD453E01</string>
</dict>
</plist>