added spot image import script (#38)
added utility module

atm contains the following:
* hashing: SHA-1 hashing for byte arrays
* MIME type parsing and predefined values for images
removed db password configuration option from tests

pg_hba.conf needs to be updated on every dev system. more information
can be found at https://redmine.kirdev.sch.bme.hu/projects/vip/wiki/KorokJUnit
fixed db schema to have valid default values in new columns

* deleted obsolete IM protocols
* renamed screen_name column to account_name to avoid confusion
updated domain to use paths instead of blobs for images (#38)

* added configuration for iamge uploads (path, max size)
* new model for image uploading (ProfileImage)
* removed some util classes, and added dependency for sch-pek-util
* also eager fetch ImAccounts with user
updated ejb to use the file system for image storage (#38)

* introduces PekEJBException for unified error handling
* saving and deleting image files
* resizing images on upload
updated web to use the user attributes (#38)

* read profile images from disk
* refactored PersonForm to be contained in a panel
* introduced PersonFormPanel and AdminPersonFormPanel