add set RHO_WP8 constant for ruby part and enable stringscan extension
add set RHO_WP8 constant for ruby part and enable stringscan extension

rhosilver/rhodes-1,louisatome/rhodes,rhosilver/rhodes-1,UIKit0/rhodes,rhosilver/rhodes-1,louisatome/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,UIKit0/rhodes,louisatome/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,louisatome/rhodes,louisatome/rhodes,louisatome/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,rhosilver/rhodes-1,rhosilver/rhodes-1,rhosilver/rhodes-1,louisatome/rhodes,UIKit0/rhodes,louisatome/rhodes,UIKit0/rhodes,UIKit0/rhodes,rhosilver/rhodes-1,UIKit0/rhodes,UIKit0/rhodes,louisatome/rhodes