proposal to fix #74: add reply button

- added "reply" button to the left of the "delete" button
- removed the click listener from the .post-content
some more UI tweaks for #74

- removed bg color from the buttons
- added more whitespace to separate different posts
- added border to separate meta data from post content
Merge pull request #85 from aheusingfeld/master

proposal to fix #74: add reply button