Rename JsFiles to JSFiles for consistency with Go norms.
Rename JsFiles to JSFiles for consistency with Go norms.

bpowers/gopherjs,albrow/gopherjs,govlas/gopherjs,Archs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,albrow/gopherjs,Yanjing123/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,albrow/gopherjs,gopherjs/gopherjs,jargv/gopherjs,Archs/gopherjs,bpowers/gopherjs,Archs/gopherjs,govlas/gopherjs,jargv/gopherjs,Yanjing123/gopherjs,Yanjing123/gopherjs,bpowers/gopherjs,govlas/gopherjs,jargv/gopherjs