Add command to download corpora to .travis.yml
Add command to download corpora to .travis.yml

syllog1sm/TextBlob,sargam111/python,nvoron23/TextBlob,IrisSteenhout/TextBlob,freakynit/TextBlob,adelq/TextBlob,laugustyniak/TextBlob,jcalbert/TextBlob,jonmcoe/TextBlob,syllog1sm/TextBlob,dipeshtech/TextBlob,syllog1sm/TextBlob,Windy-Ground/TextBlob,sloria/TextBlob,beni55/TextBlob