Add Support for Single Expression in `if`

Issue originally opened here:

http://code.google.com/p/java2python/issues/detail?id=45

The original problem is no longer present, however, the attached file does not translate correctly for a different reason.

Need to support the form:

```
if (expr) 
    foo
else {
    bar
} 
```

And the form:

```
if (expr)
    foo
else
    foo
```
