Add --namefield option for dynamic metric names.

The --namefield option is used to specify a field in the search results
with values that should be part of the metric name. This functionality
allows users to build dynamic names as part of a Splunk search.
Show metrics as Splunk results and add noop option

This change sends the metrics and values back to Splunk so they can be
displayed to the user. It also adds a "--noop" option to the graphite
command which shows the results but doesn't send them to the Graphite
host. This option is useful for testing to make sure the metric names
look correct before commiting them to Graphite.
Merge pull request #3 from davidnarayan/develop

Add --namefield option for dynamic metric names.