Add a list of tags

[nielsenramon]

No description provided.

[xRahul]

If the way I've implemented it makes sense, I can pick this up and do similar thing here. Let me know what you think.

[migueldemoura]

Really like this one. Good idea, @xRahul :D

[xRahul]

cool.. I'll work on creating the PR then

[jmarca]

I'm working on a related thing...automatically generate the _my_tags/<tag>.md files based on the tags in the posts. Work in progress is here.

The guts are in this file: https://github.com/jmarca/chalk/blob/feature/automate_tags/bin/tag_scraper, and I linked it into the package.json too.

Started to make a pull request, but I forgot to add tests, make sure travis or circleci or whatnot pass. And I also realized that it needs changes to README, example posts, etc etc. I hope to get to that soon.