Added trace info.

Separate logic for import board to youtrack
Link source code of YouTrackSharp. Look like we use old version

Compete import cards logic
Add log import
Add log import
Fix
Merge branch 'Server'

Conflicts:
	YouTrello/YouTrello.Logic/Services/YouTrack/YouTrackService.cs
	YouTrello/YouTrello.Logic/YouTrello.Logic.csproj
	YouTrello/YouTrello.Tests/IntegrationTests/Logic/YouTrackServiceTests.cs