supress retweets

Sample from local search for kickstarter
```
roobot> Tweet: Tickets for the inaugural edition of @docnrollfest 25/28th September at @HackneyPH https://t.co/Mdov7fBvue #London #Music #documentary - @MartaRBlonde http://twitter.com/MartaRBlonde/status/507844334620667907
roobot> Tweet: Lanciata la campagna #Kickstarter del remake di #Pathologic http://t.co/Uy7QLkW1TD - Il primo era ostico per difficoltà e bug, ma figo - @ScizLor http://twitter.com/ScizLor/status/507844340366843904
roobot> @Gotham__ENigma retweeted http://twitter.com/ukanime/status/507832928173572096
roobot> @rbhzk07 retweeted http://twitter.com/AnimeAnime_jp/status/507177650230530048
roobot> @NathanFrench10 retweeted http://twitter.com/icrowdfundbuzz/status/507823281442148352
```