DbSync Report Creation

## Description

This PR is for allowing a Report to be created via a command argument. It utilizes the Nuget Package [RestSharp](http://restsharp.org/) and the [Mailgun Api](http://www.mailgun.com/) for sending the Report via Email. An individual email is sent for each unique mapping in the TableMap.json file. 

The body of the email includes the following information:
  + Whether or not row counts of each table within the unique mapping are equal from the Source & Destination schema.
  + A report of the comparison of data from the `sync_changes` table to check that both the Source & Destination table's records have correct synchronized data, if not, which Primary Key is off, & the column that is mismatched.
  
*Note: in order to obtain an api key & base url, a Mailgun account is required.*
The Base Url, Api Key, Sender, & Recipient values are located in the `App.config` file, modification of these nodes with the user's unique values are required into order to successfully send the report.

*Also: the full command is:* 'DbSyncService.exe report'