Install cJSON.dll

Change-Id: I8339bbcac0ff7cf51a0f5a4d35e27a69a67326bb
Reviewed-on: http://review.couchbase.org/34740
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>