Merge pull request #2038 from stambetto/development

Minor fixes
[FIX] table overflow ref issue #2022
[FIX] Removed duplicate SQL upgrade
[FIX] Properly run all upgrades
[FIX] worker notification switch in user notifications
Merge pull request #2042 from iAmShorty/notification-switch

[FIX] worker notification switch in user notifications
[FIX] isset host
Merge branch 'development' of https://github.com/MPOS/php-mpos into development