Fix cut and copy events
Fix cut and copy events

- Do not actually cut on cut
- Strip trailing whitespaces on copy (fix #66)
xtermjs/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,akalipetis/xterm.js,xtermjs/xterm.js,Tyriar/xterm.js,sourcelair/xterm.js,cjordog/NRLWebsite,sourcelair/xterm.js,xtermjs/xterm.js,sourcelair/xterm.js,akalipetis/xterm.js,cjordog/NRLWebsite,Tyriar/xterm.js,Tyriar/xterm.js,xtermjs/xterm.js,cjordog/NRLWebsite,akalipetis/xterm.js,cjordog/NRLWebsite,Tyriar/xterm.js,akalipetis/xterm.js,sourcelair/xterm.js