closes #579

closes #526
closes #525

Added a `build.py` script for compiling and packaging. Added post and pre install scripts to handle installation and upgrades in a cleaner way. Minor fixes to the init script and service unit file.

godep seems to have a problem when dependencies have `internal`
packages. So removing `godep go build` and `godep go test` from the
build process in favor of just checking out the correct revisions using
`godep restore` into the regular GOPATH.

This basically means that we are not actually using anything within the
Godeps directory except Godeps.json. I should probably make a separate
go dependency management system that does this.

closes #338

fixes #293

closes #325

removed HTTP listener port in docker compose. Not being used by plugin.

NSQ output plugin, following the NSQ methodology output is a producer
to one instance of NSQD. The go library does not accept array values be
default for a Producer. Additionally service discovery is generally
done as a consumer.

Follows same methodology as Kafka Output without the tag reference.

closes #315

closes #314

- Does not use the aerospike client, but sends the stats command
  using the aerospike required format
- Queries available namespaces and gets stats for all of them

closes #300

The init script fails if another process has the word "telegraf" in
it, for example if you aren running "vi /etc/opt/telegraf/telegraf.conf"
or "tail -f /var/log/telegraf/telegraf.log".  This is because
the "-f" flag to "pgrep" will show processes with the search
string anywhere in the command-line.

This patch turns it around and gets the "ps" output for the process
in the pidfile, and if that line has "telegraf" in it, it considers
it to be running.

Closes #266
Closes #267

since spotify/kafka docker image already exposes zookeeper

Closes #262

The test to see which version of `useradd` is installed uses 'bashisms'
that fail on Ubuntu due to the fact that `/bin/sh` is symlinked to Dash,
causing the telegraf account to be created without the `--system` option
ever being passed.

This change amends the syntax so that it's POSIX-compatible and more
portable as a result.

Closes #205

Closes #212

Fixes #186
Closes #203