added and overview calculation that saves out to the mongodb. Currently only calculating counts
Merge branch 'dev' of https://github.com/votinginfoproject/Metis into dev
Merge branch 'dev' of https://github.com/votinginfoproject/Metis into dev
Moved the overview calculations into it's own folder, also have it calculating and aggregating all the fields for every ballot and its children in the mongo DB for a given feed.
refactored the overview processor now fully calculates the total fields and the amount of ballots and contests in a given feed.
Merge branch 'dev' into rulesEngine

Conflicts:
	config.js
	dao/schemas.js
Began implementing REST Services for returning errors

* Implemented service for returning:
    * All errors in a feed
    * Errors in source element
    * Errors in election element
    * Errors in precinct street segments
    * Errors in precinct split street segments
* Updated uniqueId rule to track extra information needed to return errors