CC-5570: Tracks get scheduled ahead of their show start time
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x
CC-5571: Overlapping show check in wrong sometimes

The incorrect number of days we're getting added to create repeat instances
because we were checking the start week day in UTC instead of local time
Fixed updating single show instance problem where it wasn't fetching
the current instance
CC-5583: Force database to be UTF8 regardless of terminal locale
CREDITS update for 2.5.1
CC-5584: Quick PHP version check (5.4+)

* Thanks to John Chewter for connecting the dots on this one!
Nothing to see here, just a typo...
Merge branch '2.5.x' of github.com:sourcefabric/Airtime into 2.5.x
CC-5589: SQL error when adding/moving a scheduled item

Error was occuring when a moved item didn't exist in a linked show instance
Error was also occuring when trying to insert item into a schedule localtion
that does not exist in a linked instance.

Fixed by skipping the move action if the file does not exist in a linked instance,
cleaning up the position numbers after deleting schedule items, and by
setting the insert time to the show start time in a linked instance is empty
Merge branch '2.5.x' of https://github.com/sourcefabric/Airtime

Conflicts:
	install_minimal/include/AirtimeInstall.php
	install_minimal/include/airtime-install.php