Fix off-by-one error that was masked by TextMateLanguageMode
Fix off-by-one error that was masked by TextMateLanguageMode

TextMateLanguageMode.isRowCommented would return `undefined` instead of 
`false` for out-of-bounds rows.

atom/atom,Mokolea/atom,stinsonga/atom,t9md/atom,PKRoma/atom,liuderchi/atom,Mokolea/atom,brettle/atom,t9md/atom,t9md/atom,stinsonga/atom,brettle/atom,atom/atom,stinsonga/atom,PKRoma/atom,atom/atom,brettle/atom,stinsonga/atom,PKRoma/atom,liuderchi/atom,liuderchi/atom,Mokolea/atom,liuderchi/atom