Update README.md
Clean tweet data before insert it in the database
Merge pull request #9 from ettoredn/retweets

Clean tweet data before insert it in the database
small changes
using util instead of overloading the method
splitting in method
modif
no message
Modified the filter method (we now filter by location)
Modified the stream listener. Exception doesn't stop the stream (it log the error instead)
min change
Added log directory