Add support for core.async styling
Remove duplicates previously highlighted
Merge pull request #200 from ToBeReplaced/core-async

Add support for core.async styling
Remove mention of clojure-defun-style-default-indent from readme.

Mentioning this in the readme could be mistakenly interpreted as
implying endorsement, which we want to avoid. The docstrings are still
there for people who know what they're looking for.