Make this openwhisk cli able to be installed by major installation tools

[houshengbo]

Under mac, linux and other major operating systems, openwhisk cli needs to be installed by software management tools, like homebrew, apt-get, gem, etc.

[houshengbo]

@lzbj could u look at this issue?

[lzbj]

@houshengbo , for brew, we can refer this article:
http://liam0205.me/2016/07/30/release-your-own-app-in-Homebrew/, what do you think?

For ubuntu, I'm still investigating.

[houshengbo]

@lzbj Good, man. Please research in the major ways of releases in the three operating systems: mac, Ubuntu and windows.

[InTheCloudDan]

@lzbj not sure if you've seen these options before:

https://github.com/jordansissel/fpm

https://github.com/packpack/packpack

Out of the 2, fpm will probably be the most flexible for creating packages.

[Juice10]

Homebrew thread: #153

[mrutkows]

@Juice10 We need to assure that everytime wsk CLI is built as part of an Apache release, that the Travis is able to push a new version to homebrew...

[rabbah]

wsk available via brew now.