Added intensifier adjectives.

Word list now has positive words, negative words and intensifier adjective words. The adjectives contribute with multiplicative factors to the sentimental value of the statements. 
ex: "I am happy" returns score 3, "I am so happy" returns score 6, "I am ecstatically happy" returns score 9. The same adjectives have the same multiplicative factors for negative words, and thus increase the negativity value of the sentence. 

Cheers! :)