Implemented Admin API support

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Extended test with getCount() for byExample()

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Implemented getClientVersion() as a better name and aliased getVersion(). We should think of if we need to deprecate getVersion.

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Extended documentation and changed some thing in tests

Signed-off-by: Frank Mayer <frank@frankmayer.net>
Merge pull request #45 from frankmayer/devel

Implemented Admin API & some test additions