[CHANGE] allow attribute and value to be positional parameters
[CHANGE] fail if "value" is used in "get";
[FORM] use elif in "set"-parameter-check;
[FORM] pep-8;
[DOC] example;
[CHANGE] show if value is unchanged after "set";
[CHANGE] get() does not need the resourceid parameter;
[FORM] pep-8;
[FIX] show correct message when trying to delete non existing entry;
[FORM] pep-8 (indent);
[CHANGE] use bson.json_util as a replacement for json;
[CHANGE] default srvinv url to http://localhost:8081/;
[FORM] pep-8;
Merge pull request #17 from aboutyou/develop

several improvements for the srvinv cli and compliance to pep-8