seems the ZipArchive class is not always compiled into php, so included a test and a fall back to unzip system call

Removed system calls to extract and replaced them with image_scale. Fixed hard links to /tmp/ folder

Initial commit of pblog module. The easiest way to add a gallery to users posts. Displays one random thumbnail in teaser and the full gallery in node. Adding a blog including a gallery is as simple as uploading a zip or tar.gz file, this module will create thumbnails and organise the images.