A couple more improvements

Author: makermelissa

adafruit_shell.py

@@ -142,6 +142,21 @@ def reboot():
         """
         os.system("reboot")
 
+    @staticmethod
+    def getcwd():
+        """
+        Get the Current Working Directory
+        """
+        return os.getcwd()
+
+    def chdir(self, directory):
+        """
+        Change directory
+        """
+        if directory[0] != "/" and directory[0] != ".":
+            directory = self.getcwd() + "/" + directory
+        return os.chdir(directory)
+
     @staticmethod
     def is_root():
         """