rhbz1110627 zanata init

https://bugzilla.redhat.com/show_bug.cgi?id=1110627
and https://bugzilla.redhat.com/show_bug.cgi?id=1038852

Depends on https://github.com/zanata/zanata-api/pull/15 and https://github.com/zanata/zanata-server/pull/520
The contents of this block could go in a separate method so it is immediately clear what the block does, e.g.

```java
if (answer.equalsIgnoreCase("n")) {
    printUsageForExcludes()
    return new SourceConfigPrompt(console, opts).promptUser();
}
```