Enable support for macOS 10.12 Sierra

[CGamesPlay]

Since SIP landed, /usr/local/bin has been removed from the default paths. You can confirm this with ssh new-sierra-host env, and inspecting the PATH. To fix this, I needed to ensure that /usr/local/bin is added via .bashrc for the non-admin running user.

Additionally, the TMPDIR on macOS is readable only by the user who created the file. In chef's case, this means root. This means that no chef script resource that runs as a user can actually succeed, because the interpreter can't read the script file. I added a line to solo.rb to set the TMPDIR to something world-readable.

[coveralls]

Coverage decreased (-0.2%) to 89.265% when pulling 6ceb47d on CGamesPlay:master into 5e9f652 on matschaffer:master.

[aried3r]

@CGamesPlay I think the tests that fail have been fixed on the master branch. So I think if you would rebase your branch on the current master branch, your PR should have successful test runs.

[coveralls]

Coverage decreased (-0.2%) to 89.077% when pulling f813f54 on CGamesPlay:master into baa77a5 on matschaffer:master.

[coveralls]

Coverage decreased (-0.2%) to 89.095% when pulling fa44870 on CGamesPlay:master into bedc100 on matschaffer:master.