Upgrade tablesorter v2.16.3 -> 2.17.8
 -- https://github.com/Mottie/tablesorter/wiki/Changes#version-2178-9152014
* Use default filter to put the **Episode** filter into regex mode for better matching
  > Allows you to do things like `Show Name - 5x` to see all the matching items for the season.
* Changed ignore articles from `The|A` to `The|A|An`.
* Add hack for the show 'A to Z' to not ignore the article when sorting.
Merge pull request #877 from thezoggy/dev--tablesorter_update

tablesorter update
Add option to show all seasons on displayShow by default (restore previous expected behavior) on config/hidden or via config itself.
Add Pushbullet notifier
  * Includes support to send to a specific iden or all devices.
Merge pull request #879 from thezoggy/dev--pushbullet

Add Pushbullet notifier
Merge pull request #876 from thezoggy/dev--option_for_showseasons

Add option to show all seasons on displayShow by default (restore previous expected behavior) on config/hidden or via config itself.
Add missing provider source images (nzb/torrent)
Add 20min delay to OMGWTFNZB rss updates due to recent propagation issues.
Update readme to reflect downloads have a new home, also remove some now defunct info.
Merge pull request #881 from thezoggy/dev--fixes

dev fixes
Handle when `source` is not set for whatever reason.
Merge pull request #884 from thezoggy/dev--history_hotfix

Handle when `source` is not set for whatever reason.
Handle when OMG is offline for maint, increase post delay from 20 to 25.
Cleanup how we build our show name list to filter out duplicates that only differ by case, also dont append `.` if search string is empty.
Added priority, device, and sound support to Pushover
Fixed minor typo/logging issues, also handle device lookup js data more gracefully.
Fix config typo: `pyTivo_update_library` -> `pytivo_update_library`
Merge pull request #886 from thezoggy/dev--pushover_update

Pushover notifier update
Merge pull request #885 from thezoggy/dev--omg_update

OMG update
* Convert `_` to `.` in release names for OMG and Womble, fix releases getting rejected by invalid show name.
* OMGWTFNZBs: Skip nuked releases on backlog search.
Womble: Adjust rss feeds used.
Merge pull request #889 from thezoggy/dev--omg_update2

OMG update2