Added Hough lines detector and Steganography methods 

houghLines()
![lines](https://f.cloud.github.com/assets/3799830/1148923/d8fe7778-1ed0-11e3-8e7f-07c47c8ef1e7.png)
![lines](https://f.cloud.github.com/assets/3799830/1148926/eb86e524-1ed0-11e3-8cd5-bc89860b129e.png)

IMAGE STEGANOGRAPHY

How to encode :

Let the message be : congratulations ! you have successfuly decoded the image
Let the password be : simplecv-js

so we first do 
  <code>lenna.stegaEncode(message, password)</code>
on this image

![lenna](https://f.cloud.github.com/assets/3799830/1148939/4fa4475e-1ed1-11e3-9712-4e0615fe2701.png)

After applying the method the encoded image will be automatically downloaded . Open it and save it in a folder 

![print](https://f.cloud.github.com/assets/3799830/1148954/b13ceba6-1ed1-11e3-8910-dcca416a6974.png)

How to decode:

Now on the encoded image apply 

<code>encodedLenna.stegaDecode(password)</code>

![decode](https://f.cloud.github.com/assets/3799830/1148964/fe8ae94e-1ed1-11e3-9ee7-31e15423c228.png)

You get the decoded message like this

![answer](https://f.cloud.github.com/assets/3799830/1148970/16928916-1ed2-11e3-9c8c-1b10282b499c.png)