make regeneration worker unique, (only schedule/execute once at a time)

Try to fix Travis CI setup

improved how "show more" link looks

Fix #365, 1/2 of #408 - replace rails_autolink with URI.regexp, run link_hashtags on simplified_format

with YAML-defined defaults. Add admin page for editing global settings. Add "site_description"
setting that would show as a paragraph on the frontpage

fix bug in process feed service

Fix #233, fix #268

can be processed separately

footprint of each running process by 128mb