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
Since there are several methods that expect different types of answers, it might be more flexible and easier to extend if there was just one method that takes a `ResponseValidator`, and provide some default validators as static fields. e.g. `String answer = expectAnswer(ANY)`, `String answer = expectAnswer(NOT_BLANK)` or `String answer = expectAnswer(anyOf(someStrings))`. Any of these could also work with `expectAnswerWithRetry()`.