added list of intensifiers, adjectives that multiply sentiment values

added intensifiers functionality, adjective multiply the effect of positive or negative words

updated readme with adjectives examples

modified intlist

added tests for negative adjectives

added callback to functions in test

fixed assertion

fixed tests

fixed tests

added neg tests

fixed tests

fixed tests

added positive tests

fixed positive tests

modified intlist
Merge pull request #2 from Martikos/master

Added intensifier adjectives.