Fix case-sensitivity issue breaking app under Linux.
Fix case-sensitivity issue breaking app under Linux.

dalbymodo/universalviewer,dalbymodo/universalviewer,britishlibrary/UniversalViewer,WSULib/universalviewer,WSULib/universalviewer,britishlibrary/UniversalViewer,britishlibrary/UniversalViewer,dalbymodo/universalviewer,WSULib/universalviewer,dalbymodo/universalviewer,britishlibrary/UniversalViewer,britishlibrary/UniversalViewer,WSULib/universalviewer,WSULib/universalviewer,dalbymodo/universalviewer,WSULib/universalviewer,britishlibrary/UniversalViewer,dalbymodo/universalviewer