Update to current mainline version of openresty.

* Also added in -j N to make, since this no longer errors at build time.
Added multi-job support to erlang build

We originally did not enable this for OTP because
R14 builds would fail on their initial run through.  However
testing under R15B2 shows that multiple jobs now complete
consistently without errors.
Update redis to stable 2.6.x series.
Merge pull request #87 from opscode/mp/oc-9337

update redis and openresty to latest versions