Merge pull request #1 from ilkerde/master

Fix nant build & include graceful execution option.
Added nant and nantcontrib binaries to the tools directory.
Script for nuget package
Fix NullReferenceException
Add additional asserts to the CommandLineProgramExecuteTests
Merge branch 'develop' into master

Conflicts:
	src/c24.Runman/CommandLineProgramExecuteTests.cs