Upgrade to rspec 2.14

This adds
- expect(obj).to receive(:method)
- allow(obj).to receive(:method) #stubbing
- allow_any_instance_of(Class).to receive(:method)

There are a number of deprecations

- Use `double` instead of `mock` or `stub`
- Use `stub` instead of `stub!`. But to be honest, there is a new syntax that is preferred: `allow(Object).to receive(:method)`
- No longer support `lambda {}.should_not raise_error(Class)` - use `expect { }.not_to raise_error`. Note the class name is no longer specified

This PR only updates deprecated methods in specs. It does nothing else