add support for using influx-cli from docker

[bbinet]

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[Dieterbe]

like i mentioned in #13 this seems like overkill to me, especially with the wrapper script. what do other people think of this? to merge or not to merge?

[bbinet]

As you want :)
I did it for my own need: I didn't want to setup a full golang environment just for influx-cli, and because I already use docker for this kind of thing, adding a Dockerfile was a good way for me to use influx-cli.

And once influx-cli is available on docker hub, you can also pull the image directly:

$ docker pull bbinet/influx-cli
$ docker run --rm -ti bbinet/influx-cli

The wrapper script is ther to make it easier to use influx-cli config file and to easily work with pipes.