Added configuration support for changing the default tracing level for Clide.

Added VS2013 manifest.
Added IDevEnv.Restart
Added integration test that verifies that Clide is way faster than regular IVsSolution traversal :)
Added asynchrous build and retrieve output assemblies
Refactored selection retrieval to use IUIThread instead of hardcoding the access to the static class.
Added new packages for async.
Updated all source to remove+sort usings.