Add alerting and getinfo_MP

Please see notes here guys http://pastie.org/pastes/9733526/text?key=luz9fdv1whtvfhn1sjvckg

Before merging can we grab an hour to build this and run over how it works/test it out.

Thanks
Z
Usually the flag in /src/clientversion.h is used, but I'm not sure, if this overwrites the "alert string" in the UI:

```c++
// Set to true for release, false for prerelease or test build
#define CLIENT_VERSION_IS_RELEASE  true
```

See also: https://github.com/bitcoin/bitcoin/blob/master/doc/release-process.md