added ROI detection and drag & drop interface to choose ROI
updated caching for photo thumbnail to work with ROI immediately
added entropy implementation for gd
fixed bug cannot delete newly uploaded photos
added photo view update
added album view count
removed scoring built-in support
added support for album like
added support for album comment
updated delete flow for user, album and photo
updated introduction phrases
added demo data auto-installation
updated installer script
added proper management tools for devices and locations
added device code management
added devices/photos route support
added locations/photos route support
v0.9 -- version bump (usable now)