Blog post on storage formats

[Harshad Deshmukh]

Hello all,

I have written a blog post on various storage formats implemented in 
Quickstep. Please review the pull request - 
https://github.com/apache/incubator-quickstep-site/pull/2 and provide 
your feedback. If you don't have jekyll set up on your machine, you can 
use this link to read the post: 
https://github.com/hbdeshmukh/incubator-quickstep-site/blob/storage-formats-post/_posts/2017-03-30-storage-formats-quickstep.markdown

The SQL formatting doesn't look well on GitHub, but I think it shows up 
alright on the actual website.

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Thanks,
Harshad