This commit adds links to the _New Issue_ section of Github.
The intention is to provide more hints where to get help and
further reduce the amount of Github issues that can not be
acted upon.
It also updates the README and the bug_report template to reflect
the changes. Additionally, in the README some relevant shields from
shields.io are added.
The labels follow [label-schema.org][lsorg] and the [OpenContainer
image spec, section annotations][ocis], specifications.
[lsorg]: http://label-schema.org/rc1/
[ocis]: https://github.com/opencontainers/image-spec/blob/master/annotations.md
