Sendfile: allowing runtime specification

Merge pull request #13 from bryanlatten/feature-sendfile

Nginx: allow runtime specification of sendfile

Dockerfile: updated to Ubuntu 14.0.4.3

Also added flag to prevent supervisor from spitting errors from attempting to navigate a stream (as opposed to a file)

Workers: added entrypoint to allow long-running processes managed by supervisor

Merge pull request #11 from bryanlatten/feature-supervisor

Dockerfile: adding a worker CMD entrypoint

Nginx: conf replacement now idempotent

Merge pull request #10 from bryanlatten/feature-logline-duplication

Nginx: access_log/log_format idempotent

Nginx conf: upstreaming client customizations

Use $SIGNAL_BUILD_STOP to stop a build process, facilitating multi-stage builds

use $SERVER_GZIP_OPTIONS to enable static content to be served compressed

Run.sh: allow multi-stage builds with children script termination codes

Merge pull request #7 from bryanlatten/feature-script-terminate

Run.sh: allow clean termination from a child run script

run.d: add injection points to container start

Add .sh files to /run.d folder to execute during container run.

Initial: allowing base functionality with nginx

Merge pull request #5 from iderdik/enhanced/logging

Made SERVER_APP_NAME an actual env var