Add command-line argument to force use of x86 agent
Make -process:Multiple the default; implement Dispose correctly; make console run on the highest available runtime
Fixed the XML comments, made some code style changes and set items to null or clear collections in Dispose just in case someone makes a mistake and calls Dispose twice
Removed the use of AssemblyReader from ProcessRunner and get the x86 value in RuntimeFrameworkSelector
Don't set the real runner in MasterTestRunner to null on Dispose
Merge pull request #349 from nunit/issue-238

Issue 238