Make sure hot spot pitch and yaw are numbers (fixes #209).
Make sure hot spot pitch and yaw are numbers (fixes #209).

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