Added iskeyword command to the syntax definition
Added iskeyword command to the syntax definition

Factor words can include almost any byte.
In ftplugin/factor.vim ranges 33-126 and 128-255 are defined
as valid characters for Factor words so I copied those ranges.

tgunr/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,factor/factor,factor/factor,factor/factor,tgunr/factor,mrjbq7/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,tgunr/factor,tgunr/factor,tgunr/factor,mrjbq7/factor,factor/factor,factor/factor