update for v13 release

add CHANGELOG

Support no_proxy environment variable

octokit uses faraday for making http_request.
There is a long standing issue in faraday to add support for the no_proxy environment variable: lostisland/faraday#247
Unfortuantely it seems like this is going nowhere.
A workaround is suggested in this issue: berkshelf/berkshelf#1341

The httpclient (and excon) farady adapter picks up proxy settings from the environment automatically.

link directly to the PR on github

namespace contexts to concourse-ci

This ensures that custom contexts will not be rerun.

specify a custom context for a `put`

specify a custom context for a `put`

redirect all git to stderr

Signed-off-by: Kelly Gerritz <kelly.gerritz@gmail.com>

add Perl for git-submodule support

Signed-off-by: Kelly Gerritz <kelly.gerritz@gmail.com>

Update LICENSE