Bug Fix

* NuGet: Fixed #9: `Add-PrigAssembly -AssemblyFrom` went dead. => This is the side-effect of Issue #7. Changed the step to generate the path `tools` in the same manner as another(e.g. function `SetStubberPreBuildEventProperty`).
* NuGet: Fixed #10: `prig -p ConsoleApplication1.exe` went dead. => This is the side-effect of Issue #7. Corrected the function `Invoke-Prig`(alias: prig) to ignore the parameter `$Arguments` if it is null or empty.
* Profiler: Fixed #11: In .NET 3.5, the assembly containing dynamic methods can't be called indirectly. => This is by design of the Unmanaged Profiling API, so change the behavior to ignore them depending on whether their names aren't empty. Because I seemed that the names which come from ICorProfilerInfo::GetModuleInfo are empty when loading dynamic modules.