Add description of the TAP protocol
Add description of the TAP protocol

This is an updated copy from:
http://www.couchbase.com/wiki/display/couchbase/TAP+Protocol

Change-Id: I49d258d570b52b9440f89efb4bdbbdd35af0ad5e
Reviewed-on: http://review.couchbase.org/59307
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

couchbase/memcached,owendCB/memcached,couchbase/memcached,daverigby/memcached,couchbase/memcached,daverigby/kv_engine,owendCB/memcached,daverigby/memcached,owendCB/memcached,owendCB/memcached,daverigby/kv_engine,daverigby/kv_engine,couchbase/memcached,daverigby/memcached,daverigby/memcached,daverigby/kv_engine