Convert FilterItem to NSEW coordinates
moved querying of features behind IEsriService interface.
relative external datasplice-suite dependency

This commit removes the externals dir and its initialization script and instead makes a relative dependency to the datasplice-suite solution. The purpose of this is as a step towards having the plugin build and tested automatically on our CI server.
preparation for running tests on ci server

https://social.msdn.microsoft.com/Forums/en-US/1a5666d7-a745-4258-8f21-567dc79c0574/buildshadowtask-failed-unexpectedly-accessor-problem-upconvert-vs-2005-to-2008-urgent?forum=vststest
build scripts
remove reference to .vsmdi and testrunconfig from solution
Merge pull request #10 from DataSplice/relative-external-dependency

Relative external dependency