had to move jquery timeago back to root, added js for org edit page. fixed styling of header when org logo and banner are present

moved js and css files into structured directories

bug fix for show_export.html.erb and to jquery.timeago.js

removed rake wrapper task because json dir can be set in initializer. Added initializer and updated _('') to __('') DMPRoadmap/roadmap#204

hacked jquery.timeago.js to work with new gettext localisation. Added timeago text to pot and po files. DMPRoadmap/roadmap#204

moved assets from app/assets to lib/assets. The files in lib/assets will be used by Rails unless override by an equivalent file in app/assets. Added logic to applicationController so that it will look first for a template in app/views/[:branded folder name] before using the default in app/views