Fixed missing slash on Kat mirror URL

Changed http://www.kickmirror.com to http://www.kickmirror.com/
Switch from urlencode to json

Per the Pushbullet API (https://docs.pushbullet.com/http/) the POST should use a JSON body, with content-type 'application/json'
Merge pull request #765 from aelveborn/kat-mirror-fix

Fixed missing slash on Kat mirror URL
Merge branch 'master' of https://github.com/jmelen/SickRage into dev
Sports regex updated
Testing fix for missing api key on newznab providers
Merge pull request #773 from adam111316/newznab_fix

Testing fix for missing api key on newznab providers
Fix for daily/backlog checkbox values not saving correctly on providers
Merge pull request #774 from adam111316/fix_provider_settings

Fix for daily/backlog checkbox values not saving correctly on providers
Test #2 to fix daily/backlog checkboxes with custom newznab server
Merge pull request #775 from adam111316/newznab_fix_2

Test #2 to fix daily/backlog checkboxes with custom newznab server
Merge remote-tracking branch 'upstream/dev' into dev-search-options-not-saving
Fix for the bug: "Backlog and Daily search option not saving correctly".
Added hidden input for overwriting the checkbox input. If checkbox is unticked, it always get's send as post data.
https://sickrage.tv/forums/forum/help-support/bug-issue-reports/7850-dev-backlog-and-daily-search-option-not-saving-correctly