Makes it possible to load the party player apps from a different location as the web_root of the PZP

Jira issue: APPPARTY-69
Makes it possible to load the party player apps from a different location as the web_root of the PZP

Jira issue: APPPARTY-69
Merge branch 'APPPARTY-69' of https://github.com/eelcocramer/app-PartyPlayer into APPPARTY-69
Merge pull request #37 from eelcocramer/APPPARTY-69

Makes it possible to load the party player apps from a different locatio...