#78 Re-added the char counter to the input field on top of the page
Fix #82: Image should replace the image link

1. The image link is now replaced by the <img> tag. Therefore the image is placed at the position in the text where the link has been before.
2. We now use jQuery's `.html()` function instead of the `.text()` function to read the .post-content and write it back afterwards. The reason is that the HTML of anchor tags/ links in the post content would be lost other wise as it is not returned by the `.text()` function.
removed obsolete file
layout refinement