Added "stroustrup" option for brace-style

The `brace-style` rule now takes one option, which can be either "1tbs" or "stroustrup". The only difference between the two is that "stroustrup" requires `else`, `catch`, and `finally` to be on a new line after the closing curly brace:

```js
// 1tbs
if (foo) {
    doSomething();
} else {
    somethingElse()
}

// stroustrup
if (foo) {
    doSomething();
} 
else {
    somethingElse()
}
```

In addition, I've set the `.eslintrc` for ESLint to explicitly use the "1tbs" option.

Fixes #645
Fixes #644