Update CI and add version command

[ebati]

What does this do / why do we need it?

• Update travis.yml to release binaries on tag
• Add version command
• Update docs to reflect changes

What should your reviewer look out for in this PR?

Do you need help or clarification on anything?

Which issue(s) does this PR fix?

• fixes dep version #209
• fixes Just release binaries to github #957

[ibrasho]

I'm not sure we want to remove the traditional way of getting Go tools from the README. 🤔

[ebati]

Will go get be the normal users installation method or it will be there as a note developers. If it is for normal use, I dont think it is a good idea to use tool from the tip of the master.

[sdboyer]

i don't think we can remove it, but we should de-emphasize it - put it after other recommended methods.

[sdboyer]

Is it enough to write commands in travis file or you prefer Makefile/bash script etc.?

i'd prefer to have a bash script, so that we can easily run it from elsewhere if needed. can put it under hack/.

here's a block of YAML i generated for .travis.yml - i give it to you, to integrate into this PR :)

deploy:
  provider: releases
  api_key:
    secure: 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
  file: ''
  on:
    repo: golang/dep

Windows and *nix are tested on different systems, will it be a problem to release from travis without waiting windows finish?

i don't think so. we're not going to tag a release on a commit without it having passed all of CI anyway, so by the time the actual tag push happens, we'll already be sure that windows is 👍 .

[sdboyer]

just wording nits, the logic looks pretty good!

[sdboyer]

let's replace with "If you installed dep via go get, report the version instead with cd $GOPATH/src/github.com/golang/dep && git describe --tags

[sdboyer]

let's further advise against this by making the sentence read:

"If you're interested in hacking on dep, you can install via go get:"

[sdboyer]

weee!

[YAYM]

608446434

[YAYM]

department

[YAYM]

dep