Clojerl support

[metehan]

No description provided.

[atomist]

Commit messages of this repository should follow the seven rules of a great Git commit message, as mentioned in the project's contributing guidelines. It looks like there's a few issues with the commit messages in this pull request:

• The commit message subject is over 50 characters.

[weavejester]

Many of the conditional expressions have repetition that could be removed. The tests will also need to be fixed, and the CI needs to include tests for Clojerl as well.

[metehan]

Ops everything failed. @weavejester could you make an initial check if it's generally ok I can make a cleaner PR. @jfacorro have changed file names to follow https://github.com/clojure/clojurescript/wiki/Using-cljc convention. I guess you wouldn't want some filename changes right?

[weavejester]

Using cljc files is fine. The code looks generally okay.