`cider-expression-at-point` was renamed to `cider-defun-at-point` in cider.el

https://github.com/clojure-emacs/cider/commit/106da88e71b61227b0343f6bd0000927b40e0539
Update documentation to use Cider

cider.el dropped  cider-interaction-mode alias
Update dependency to cider 0.5.0
Rename project to 'ac-cider-compliment'
Rename file to ac-cider-compliment.el
Add workaround hook to docs