Refs #13 - Removed almost everything.

I will rebuild this from the ground up.
Refs #13 - Use Automapper.

Use automapper to map civicrm objects (with lowercase-and-
underscore-properties) to objects with CamelCase properties.
Refs #13 - ignore downloaded nuget packages.
Refs #13 - Fixed some code comments.
Refs #13 - find contact with given external identifier.