Implement Object.prototype.readOnly() to set properties to READONLY
Implement Object.prototype.readOnly() to set properties to READONLY

This is similar to Object.prototype.dontEnum(), just that properties
are set to READONLY instead of DONTENUM.


git-svn-id: fac99be8204c57f0935f741ea919b5bf0077cdf6@9169 688a9155-6ab5-4160-a077-9df41f55a9e9

oberhamsi/ringojs,Transcordia/ringojs,ashwinrayaprolu1984/ringojs,oberhamsi/ringojs,Transcordia/ringojs,ringo/ringojs,ashwinrayaprolu1984/ringojs,ashwinrayaprolu1984/ringojs,ringo/ringojs,Transcordia/ringojs,oberhamsi/ringojs,ringo/ringojs,ringo/ringojs,ashwinrayaprolu1984/ringojs,Transcordia/ringojs