Thrift: Added CollectorPayload and SchemaSniffer Thrift schemas
Scala Common Enrich: ThriftLoader can now deal with both old and new SnowplowRawEvents
SSC: Upgraded all SnowplowRawEvent imports to use new schema
SSC: Response to POST requests no longer includes pixel
SSC: updated test for new SnowplowRawEvent version
SSC: added test for POST requests
Scala Hadoop Enrich: removed dependency on Thrift Raw Event (closes 1248)
Scala Stream Collector: stopped decoding URLs (fixes #1217)
Scala Stream Collector: changed 1x1 pixel response to use stable GIF (closes #1260)