Revert "start supporting backgroundColor for Cube and Mulitres panoramas"
Revert "start supporting backgroundColor for Cube and Mulitres panoramas"

This reverts commit 2491c2b4dc71d66a79726d07b3b517ea24d53de1.

mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,mpetroff/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io