Merge pull request #5 from wvengen/feature/fix-basic

make it work again + improvements
use app_config gem
use geocoder for distance queries
Allow configuration of site-specific details
Merge pull request #8 from wvengen/feature/geocoder-distance

use geocoder for distance queries
Merge pull request #7 from wvengen/feature/config-site

Site-specific details are configurable
show isbn on book edit form
fix csv export