Create cljs-ipfs-api library

[madvas]

Create wrapper library for easier working with js-ipfs-api, similar to cljs-web3.
Let's call it cljs-ipfs-api.

This lib should mainly do:

• Split library into namespaces: For example ipfs.files.add function, will be in the lib as cljs-ipfs.files/add
• Do clj->js on arguments passed into a functions
• Do js->clj on objects returned from functions callbacks. Same as cljs-web3 does it.

In order to this lib to work, you'll likely need to create cljsjs/js-ipfs library. Alternative option would be to try to use new :npm-deps. It would be better, because of dead code elimination, but not sure if it's gonna work. You can give it a try.

Library should be usable in both, nodejs and browser.

As for documentation, you don't need to document every single function, since it's just a wrapper, just write something similar to cljs-web3 readme.

As for tests, no need to test every single function, just a few random, so we know cljs<->js conversions work.