Bugfix: Don't list the stor directory in the uninstaller warning message

Removed use of virtualenv in utils

Merge branch '2.5.x-installer' of https://github.com/sourcefabric/Air…

…time into 2.5.x-installer

Session pinning fix

Airtime 2.5.1

Merge branch '2.5.x' of dev.sourcefabric.org:airtime into 2.5.x

Added IRC to README

Merge branch '2.5.x-pypo-timeout-improvements1' into 2.5.x

Merge branch '2.5.x-pypo-timeout-improvements1' into 2.5.x

CC-5318 : Playout History: The last song of the show will display wro…

…ng end time.