Add JSDoc comments to pannellum.js.
Add JSDoc comments to pannellum.js.

eric-seekas/pannellum,riuson/pannellum,quentinyang/pannellum,ywjrg/pannellum,quentinyang/pannellum,psteph801/psteph801.github.io,Benvii/pannellum,Benvii/pannellum,mpetroff/pannellum,ywjrg/pannellum,mpetroff/pannellum,Benvii/pannellum,quentinyang/pannellum,eric-seekas/pannellum,riuson/pannellum,psteph801/psteph801.github.io,mpetroff/pannellum,eric-seekas/pannellum,riuson/pannellum,Benvii/pannellum,ywjrg/pannellum,riuson/pannellum,quentinyang/pannellum,mpetroff/pannellum,eric-seekas/pannellum,psteph801/psteph801.github.io,psteph801/psteph801.github.io,ywjrg/pannellum