Issue9

Moved the setting of forced auth and passive to constructor of the LoginHandler rather than per request. Updated unit tests
We always want to do:

```java
setSupportsForceAuthentication(true);
setSupportsPassive(true);
```

Should not be configurable.

>When sending to CAS, we check the request to build whether or not to send the renew or gateway params?
Yup. Just like we are doing now.