Added two brand new api calls; getblockstats and getpoolinfo

getblockstats return the basic block stats. sample response:

```
{
    "getblockstats": {
        "version": "1.0.0",
        "runtime": 243.1480884552,
        "data": {
            "Total": 7847,
            "TotalValid": "7724",
            "TotalOrphan": "123",
            "TotalDifficulty": 3447.74598482,
            "TotalShares": "13543526",
            "TotalEstimatedShares": 14121968,
            "TotalAmount": 38689.998624,
            "1HourTotal": "49",
            "1HourValid": "48",
            "1HourOrphan": "1",
            "1HourDifficulty": 15.4275624,
            "1HourShares": "59964",
            "1HourEstimatedShares": 63191,
            "1HourAmount": 240.3,
            "24HourTotal": "851",
            "24HourValid": "837",
            "24HourOrphan": "14",
            "24HourDifficulty": 315.26808561,
            "24HourShares": "1547872",
            "24HourEstimatedShares": 1291338,
            "24HourAmount": 4194.84,
            "7DaysTotal": "3421",
            "7DaysValid": "3356",
            "7DaysOrphan": "65",
            "7DaysDifficulty": 1284.64018074,
            "7DaysShares": "6459944",
            "7DaysEstimatedShares": 5261886,
            "7DaysAmount": 16829.148624,
            "4WeeksTotal": "7847",
            "4WeeksValid": "7724",
            "4WeeksOrphan": "123",
            "4WeeksDifficulty": 3447.74598482,
            "4WeeksShares": "13543526",
            "4WeeksEstimatedShares": 14121968,
            "4WeeksAmount": 38689.998624,
            "12MonthTotal": "7847",
            "12MonthValid": "7724",
            "12MonthOrphan": "123",
            "12MonthDifficulty": 3447.74598482,
            "12MonthShares": "13543526",
            "12MonthEstimatedShares": 14121968,
            "12MonthAmount": 38689.998624
        }
    }
}
```

getpooinfo returns pool info from pool config.
* currency
* coinname
* cointarget
* coindiffchangetarget
* algorithm
* stratumport
* payout_system
* min_ap_threshold
* max_ap_threshold
* txfee
* fees

Both api's requires api-key to function.

Also updated pools.md :)