Added twitter search support and URL relation to has

I added support to search twitter for specified terms. Unfortunately pip is currently not providing the latest python-twitter lib. So the current search function is not supporting hashtag searches. Support is easily added. though, but I thought I would leave this with your.
I removed the specific checks for MD5, SHA1 etc, they now use "in listTypes". This makes it a bit easier to add new hashes.
Lastly, I added the ID of the URL where the hash was found. This was something that I thought might come in handy for later releases when you might implement automated cracking or text analysis on the dump to generate dictionaries. Important here is that the DB structure changed so it is not compatible anymore with older .db files. Easy workaround would be to dump all the URL's from the old db and crawl them again....

Anyway, not sure if you want to use my code but I though I give a pull request a try ;) I hope I didn't break anything haha. Keep up the good work by the way, I like your tools!