fixed code tabulators

CHANGELOG

@@ -21,3 +21,4 @@ CHANGELOG
 - Issue #20: Added Density support (Sent by thomas.erbacher@ragapack.de)
 - Added charcode tables
 - Fixed Horizontal Tab
+- Fixed code tabulators

escpos/printer.py

@@ -31,7 +31,7 @@ class Usb(Escpos):
         self.interface = interface
         self.in_ep     = in_ep
         self.out_ep    = out_ep
-	self.open()
+        self.open()
 
 
     def open(self):
@@ -151,7 +151,7 @@ class File(Escpos):
 
     def open(self):
         """ Open system file """
-	self.device = open(self.devfile, "wb")
+        self.device = open(self.devfile, "wb")
 
         if self.device is None:
             print "Could not open the specified file %s" % self.devfile