fix the regex to ensure the dashes are in front

Author: technoweenie

lib/email_reply_parser.rb

@@ -133,7 +133,7 @@ def read(text)
 
   private
     EMPTY = "".freeze
-    SIGNATURE = '(?m)^(--|__|\w-$)|(^(\w+\s*){1,3} ym morf tneS$)'
+    SIGNATURE = '(?m)(--\s*$|__\s*$|\w-$)|(^(\w+\s*){1,3} ym morf tneS$)'
 
     begin
       require 're2'
@@ -152,7 +152,7 @@ def read(text)
     # Returns nothing.
     def scan_line(line)
       line.chomp!("\n")
-      line.lstrip! unless SIG_REGEX.match(line) 
+      line.lstrip! unless SIG_REGEX.match(line)
 
       # We're looking for leading `>`'s to see if this line is part of a
       # quoted Fragment.