Bump cfoundry

- change 'instances' to 'total_instances' to fix spec

Change-Id: Ic34c186e379c14ed5b0103e3a4513ca75f40c87a
Make rspec the default rake task again

Change-Id: Id355007c40b2d7665fc227fd8f2d7ffdeb77188e
Expose FakeHomeDir module to users of the vmc gem

 - users of the gem can `require 'vmc/test_support' in order
   to load the FakeHomeDir module

Change-Id: I235142afa2f9031d41bed013caca3d7f49ebdcfc