Added the tracing for individual query names inside a batch

[enterline]

Currently all queries inside a batch are not being captured for metrics. This change will assemble a list of the individual query names inside the batch and call metric for each one using the same batch duration for each.

[coveralls]

Coverage remained the same at 100.0% when pulling 987b21c on enterline:batch-trace into 75b6395 on godaddy:master.

[scommisso]

My only concern here is that if you're gathering metrics on a particular method (say insert-entity) and now the entire batch time is attached to the individual requests within the batch, it'll give false positives on response time spikes if the batch size is variable.

Alternatively, you could add a queryName property to the batch, and then that will be tracked separately. I like automatically doing this, though, if the # queries in the batch happens to be 1.

[asilvas]

close?

[scommisso]

close?

I'm OK with that.