Add "Series Round" sutra for ICO strategy 

- If a token creation event has been end, Proof of Donation executes a single Token creation event. but Some ICO project implement a second ICO strategies. RICO take off it easy as a simple execute.

```js
function executeNextSeries() onlyOwner() returns (bool)  {}
```
- the fail of the DAO, `function split` Can be called while propose submitted.