Make the install work on the Ubuntu 14.04
skip feeds that already exist in the medium
Merge branch 'master' of https://github.com/berkmancenter/mediacloud
Merge branch 'master' into RELEASE_20140325
First purge the databases because that script depends on perlbrew and carton.
add module and script to import stories from an external feed into a media source
Merge branch 'master' of https://github.com/berkmancenter/mediacloud
Merge branch 'master' into RELEASE_20140325