Create the database on CI/CD (#17)

* Initial appveyor config
* Move inline powershell and SQL to script files
* Create the database 
* Bumped build image to VS 2015 for SQL 2016 Support
* Refactored DB initialization code to Model assembly, and wrote a powershell script to create the migrations
* Added SQL Backup Artifact
* removed encryption from Log4Net DDL
* Added lots of Env variables
* quiet nuget output
* Added a SQL script artifact to check for schema in the database in the absence of fully automated tests