Word counts in article meta

[wizardbyron]

Hi, I've implemented the feature that show word count in article meta (between date and reading time) on my blog post.
You can see that in my site (Chinese).

The implementation has:

1. A word-count.html under meta folder along with reading-time.html.
2. A feature toggle showWordCount in params.article.
3. word-count-units attributes in i18n (Only for 'en' and 'zh').

May I create PR for this feature ?

[jpanther]

Hi @wizardbyron, this sounds like a great addition. Feel free to submit a PR.

[wizardbyron]

I've created #57, please have a review.
I need some help on other languages in i18n.