upgrade to rails 2.3.15

Fixes important security vulnerability described at http://weblog.rubyonrails.org/2013/1/8/Rails-3-2-11-3-1-10-3-0-19-and-2-3-15-have-been-released/
Fixes problem with "uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)"

Signed-off-by: Radek Dostal <rd@radekdostal.com>
fix webserver address for development

Signed-off-by: Radek Dostal <rd@radekdostal.com>
add script/tools/import_test_directory.rb

Simple script to import test photos from directory, process them and
mark them all as moderated. Photos are imported as user test.

Signed-off-by: Radek Dostal <rd@radekdostal.com>
introduce new configuration value FIND_IN_AREA_LIMIT

It limits amount of pictures simultaneously displayed on the map

Signed-off-by: Radek Dostal <rd@radekdostal.com>
Improve picture distribution for Issue #14

Changing size of grouping rectangle, so exactly FIND_IN_AREA_LIMIT fits
on the screen.

Signed-off-by: Radek Dostal <rd@radekdostal.com>
TMP

Signed-off-by: Radek Dostal <rd@radekdostal.com>