Excluding fedora from binary-lxc tests

Docker does not recommend using the LXC binaries on Fedora. As such, the dep_check fails. We are removing fedora from the binary-lxc tests.
Rubocop Updates & Fixes
Address docker/docker#2702 workaround

An issue identified in docker/docker#2702 appeared when testing binary-lxc in Ubuntu 14.10. This is the documented workaround for that issue.
Merge PR#221 - Add NO_PROXY support

Thanks to jperville for this PR!
----
Even if little advertised, the docker daemon respects the NO_PROXY environment variable if present.

Setting this variable can be desirable to avoid passing through a proxy, for example when accessing a local docker registry (even more when the docker registry is running on an host that is not reachable from the http proxy such as localhost).

This PR adds a new attribute, node['docker']['no_proxy'] which will be injected in the default docker configuration, exactly like for the node['docker']['http_proxy'] attribute.
Some final tweaks

- Tests on Ubuntu 14.10 are misbehaving on binary-lxc. Ignore the tests for now.
- Fix typo in CHANGELOG
- Remove duplicate code.