web: Add Webmenu feed field to school
rest: Add icalendar gem
rest: Add simple current event parser
Add httparty

For ical fetching
rest: Add external_feed attribute to School
rest: add webmock
rest: Implement feed cache for school
web: Allow multi values in external_feed
web: only use the first value from external_feed now
web: fix external_feed when empty
web: rename external_feed to external_feeds
rest: fix external_feeds test
rest: log feed errors to fluentd
rest: log fluentd to stdout too
rest: recusively clean fluentd data
rest: truncate large values from fluentd
Skip stdout from fluentd on rails tests
rest: document $rest_flog
rest: rename external_feeds -> external_feed_sources
rest: add feed resources