Added setting of new relic custom parameters

Added setting of new relic custom parameters

This enables better tracking of times measured by newrelic
The indentation in this block appears to be off. I think it should be aligned with the one above.

Control structures should be [surrounded by braces](http://www.mediawiki.org/wiki/Manual:Coding_conventions#Indenting_and_alignment) and we should avoid magic numbers where appropriate. There also seems to be a lot of duplication between this block and the one [above](https://github.com/Wikia/app/pull/3966/files#diff-fd498cb7e0ccd815f88d14a6cae1450fR122). Should the code be moved into a helper function? Something like:

```PHP
MetricManager::setTransactionParameterFromCountByRange( $nodeCount, self::METRIC_SIZE_CATEGORY_SIMPLE, self::METRIC_SIZE_CATEGORY_AVERAGE );
```