data, installation_id, and version should be in the POST body

[asciimo]

In DataUploadActivity.java, all POSTed data is in the query string. data and installation_id and version should be in the POST body, preferably as JSON. E.g.:

{
    "installation_id" : "d0484ec7-5549-47dn-83f...",
    "data" :  "11%2C11%2Csfgerg%2Cergety%40fghfg.com%2C3-...",
    "version" : "1.5"
}