Update readme

Author: adrianliaw

README.md

@@ -1,7 +1,7 @@
 PyCuber
 ====================
 
-PyCuber is a Rubik's Cube simulator in Python 2/3.
+PyCuber is a Rubik's Cube package in Python 2/3
 --------------------
 
 The cube can be revealed as expanded view in the terminal, 
@@ -20,24 +20,24 @@ mycube("R U R' U'")
 print(mycube)
 
 ```
-![alt tag](https://raw.github.com/adrianliaw/PyCuber/v0.1b/static/img/terminal.png)
+![alt tag](http://i.imgur.com/OI4kbn7.png)
 
 We also provided some useful tools to deal with Rubik's Cube algorithms.
 
 ``` python
 
 import pycuber as pc
 
-# Create an Algo object
-myalg = pc.Algo("R U R' U' R' F R2 U' R' U' R U R' F'")
+# Create a Formula object
+my_formula = pc.Formula("R U R' U' R' F R2 U' R' U' R U R' F'")
 
-# Reversing an Algo
-myalg.reverse()
-print(myalg)
+# Reversing a Formula
+my_formula.reverse()
+print(my_formula)
 
-# Mirroring an Algo object
-myalg.mirror("LR")
-print(myalg)
+# Mirroring a Formula object
+my_formula.mirror("LR")
+print(my_formula)
 
 ```
 ```