move nUnit dependency from MainProject to UnitTests project
fix TestSaveRailcar
SearchRailcarCommandTest
Merge remote-tracking branch 'origin/master' into UnitTests
Merge pull request #202 from olga-jane/UnitTests

Unit tests
Merge branch 'master' into D_Sidorov_HeatForPipe

Conflicts:
	src/UnitTests/Forms/Railcar/Edit/SaveRailcarCommandTest.cs