adjust some things to support unittests
fix named url for maps search
add client config migrations scripts and framework

refs #703, #647, #493 and hopefully the next ones
add USE_GEONETWORK setting
a few migration script tweaks
migrations - add id-based filtering option
fix issue with buttons not showing the pressed state see MapStory/mapstory/issues/707
remove superfluous static route
remove old STATICFILES_STORAGE setting
complete ows_url migration
add better filtering options
add back static route for testing w/ comment
extract layer download links, filter as per #766

also add caching to reduce some overhead
Merge branch 'master' into iss-700-client-side-zip
filter __MAXOSX directories from zip sniffer

refs #700