Sub variable expansion

[lksoft]

Allows for variables to be embedded into the right side of the assign and be evaluated before the actual assign. For instance if I have an existing variable product_code, I can do the following:

{% assign product_data = site.data.{{ product_code }} %}

More than a single variable can be embedded.

[lksoft]

So not sure why it says that all checks failed. I looked at the travis-ci page and it seems that the ruby 1.9.3 test failed. Though I don't think this has anything to do with the code I added. It fails installing jekyll, saying

Gem::InstallError: jekyll requires Ruby version >= 2.0.0.

So it looks like the integration setup might have an issue.