Column Expiration (TTL) Support for SimpleCassie

I’m probably the only person who still uses SimpleCassie, an early PHP wrapper for Cassandra. I like its chaining syntax and I’m too lazy to port our code over to phpcassa (although a CQL migration seems inevitable).  

Just in case there are other SimpleCassie users out there, I’ve forked it on Github to include TTL support (developed by Zhengjun Chen) and a parse() method to return friendly responses instead of raw Thrift objects. See the README file for details.