feed_items_count will be all items ever added

feed_item no longer counter_caches for feed
it updates the count by one on save, and does not decrease on destroy
clint fixes
admin error fixes

now displays all-time number of errors and number of items
added feed errors count column to feeds
worker errors will update the count on their element if it is a feed
parser base returns reponse codes along with failure messages
cleaned up filters on admin errors page
admin feeds page links to errors page delimited for that feed
feed show page lists errors and counts by message
rpsec and clint fixes
Merge pull request #41 from cloudspace/82660938_feed_item_error_count

82660938 feed item error count
Merge pull request #40 from cloudspace/82660068_total_feed_item_count

feed_items_count will be all items ever added
Basic backoff min and max settings.
Fixing linter issues.