Allow passing arbitrary fields through the traptor object

[jasonrhaas]

Would like the ability to pass arbitrary fields through the traptor object. These fields would exist as "extras" in the hash ruleset defined in Redis. In redis, hmset allows you to add any number of key/value pairs. For example,

127.0.0.1:6379> hkeys "traptor:test:0:0"
1) "tag"
2) "value"
3) "type"
4) "desc"
127.0.0.1:6379> hvals "traptor:test:0:0"
1) "test"
2) "#foo"
3) "hashtag"
4) "this is a test"

[jasonrhaas]

Complete with the latest version of Traptor.