twitter.py will download everything in config.ini
Warning: it takes a long time
At most 2000 tweets were added for each film
Merge branch 'master' into downloadAll

Conflicts:
	twitter_data/report.txt
1. Fixed a bug that all tweets were treated as from 2013 razzie
2. Reduce the sleep time between getting each tweet from 1s to 0.3s
3. Films with zero tweets will no longer be saved to json
More data
1. Ignore the films with invalid characteristics
2. Output the most informative features