Version 1.8.beta2, a few fixes

Change

• Use the replacement for the error message when running into an error while altering a table in the update process in install.php (82351c1)

Fixes

• a wrong used double quote caused a syntax error in posting.php (fcbd929)
• the check for the existence of variable $hp caused en error in the case of a not given and because of that empty content in posting.php (78c6f0d)
• create the primary key for the settings table during the update process in install.php (#61)
• add a placeholder file to make git aware of the directory img/uploaded (#63)