Server api

I implement a API for DataProcessor.

In this pull request,
only one CGI is implemented.

This receive such request:
```
{"manip" : "...(JSON string)"}
```
and execute the manipulation.

This API returns a JSON if the manipulation succeed
```
{"exit_code" : 0}
```
and if fails
```
{
    "exit_code" : 1,
    "message" : "error message"
}
```
of course "error message" is replaced.