Added flycheck integration.
Fixed incorrect symbol specification.
Updating flycheck whenever new ycmd results arrive.
Addressed some elisp cleanup warnings.
Cleaned up flycheck-ycmd.el in prep for push.
Removed default parse-result hook.

Now by default parse results will not result in any sort of
display. Users can add flycheck-ycmd (or the old decorator hook) if they
want.
Removed unnecessary major-mode specification from flycheck-ycmd checker.
Updated README with info on flycheck-ycmd.