Suggestion: Remove New Relic Integration

New Relic has a one line setup and the provider file in ARAnalytics proves the same.

```
- (id)initWithIdentifier:(NSString *)identifier {
    NSAssert([NewRelicAgent class], @"NewRelic is not included");
    [NewRelicAgent startWithApplicationToken:identifier];
    return [super init];
}
```

There is no value that ARAnalytics can provide here as there is no API to call, no data to be sent. It's all automatic. So it doesn't really make sense to use it in an app via ARAnalytics.