Release/v0.8.2

Dear friends,
I added a new command which create an issue. It gets 3 argument as follow:
    issue repository_name << title >> [issue_body]
The first two argument (repository_name and title) are compulsive and the third one is optional.
I choose '<<' and '>>' in harmony of edit command as separator, hope you like 'em too.
Please review the commits and inform me about its possible vulnerabilities.
Thanks a lot, Saeed