able to fetch the last value from the metric server
moved more logic into the facade
unit tests passing
default to return a dictionary if there is a problem fetching metrics
explicitly use the id and datapoint id instead of splitting on the underscore
Merge pull request #15 from zenoss/feature/metricfacade

Please review branch feature/metricfacade
Merge branch 'develop' into feature/batch-publish
Incorporate code review comments