Bound refresh max rows to this.rows not this.lines
Bound refresh max rows to this.rows not this.lines

this.row is the size of rows in the viewport, this.lines is the buffer. It's
only possible to refresh `0` to `this.rows - 1`.

Fixes #86

cjordog/NRLWebsite,cjordog/NRLWebsite,cjordog/NRLWebsite,akalipetis/xterm.js,sourcelair/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,xtermjs/xterm.js,sourcelair/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js,cjordog/NRLWebsite,xtermjs/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,sourcelair/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js