add count of comments to posts partial
hiding comment count from post show
add link to comment value
add read link to post single and comment link
Use a ul.inline for "N comments | Comment" links.
Left-align comment links in posts.
Give contexts in posts/single tests more descriptive names.
Better links for posts.

 - add Permalink
 - show Reply instead of "Comment" (iff you can comment)
 - Edit link shows if you have permission to edit
 - reorganised tests for post/_single
 - posts/_single now requires current_user; patch tests for comments.
Add anchor tag for comments in posts/show.
Send "N comments" links to the comments anchors.

We have to call post.save in the posts/index specs, because post_path
fails unless the post has been persisted (and hence had its slug
generated). I think. That fixed the failing tests, anyway.
Clean up post view specs as per Skud's comments.

See
https://github.com/pozorvlak/growstuff/commit/e470cf7358349c2b1488a964842225d47b7e2fa2#commitcomment-2732846
Merge pull request #119 from pozorvlak/commentcount

Counts of comments and links in posts/_single