Add a rakefile to run the specs with RSpec
Add a rakefile to run the specs with RSpec

- also fix specs broken on previous commit

jflam/mspec,ryoqun/mspec,MagLev/mspec,mkb/mspec,yugui/mspec,opal/mspec,iainbeeston/mspec,btakita/mspec,mrkn/mspec,ruby/mspec,iainbeeston/mspec,opal/mspec,MagLev/mspec,ruby/mspec,rdp/mspec,nobu/mspec,elia/mspec,alex/mspec,timfel/mspec,kachick/mspec,Gibheer/mspec,eregon/mspec,ryoqun/mspec,shirosaki/mspec,voxik/mspec,shugo/mspec,rubinius/mspec,Zoxc/mspec,kachick/mspec