Modify prepareKMeansInputFile function. Longer clips have higher chance.
 On branch master
 Changes to be committed:
	modified:   POS/src/in/ac/iitd/cse/Tests/Hollywood2.java
	modified:   POS/src/in/ac/iitd/cse/Tests/Utilities.java
	modified:   POS/src/in/ac/iitd/cse/YouTubeClip/YTClip.java