Added another useful command as a comment to .travis.yml

Author: asbjornu

.travis.yml

@@ -12,5 +12,10 @@ script:
   - xbuild ./src/GitVersion.sln /property:Configuration="Debug" /verbosity:detailed
   - mono ./src/packages/NUnit.ConsoleRunner.3.2.1/tools/nunit3-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll --where "cat != NoMono" --noresult
 
- # To run a clean build with Mono, executing just one test, do:
- # xbuild ./src/GitVersion.sln /t:Clean /verbosity:quiet && xbuild ./src/GitVersion.sln /property:Configuration="Debug" /verbosity:quiet && mono ./src/packages/NUnit.ConsoleRunner.3.2.1/tools/nunit3-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll --noresult --where "test =~ /TheNameOfTheTest/"
+#
+# To run a clean build with Mono, executing just one test, do:
+# xbuild ./src/GitVersion.sln /t:Clean /verbosity:quiet && xbuild ./src/GitVersion.sln /property:Configuration="Debug" /verbosity:quiet && mono ./src/packages/NUnit.ConsoleRunner.3.2.1/tools/nunit3-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll --noresult --where "test =~ /TheNameOfTheTest/"
+#
+# To run a clean build with Mono, executing all tests, do:
+# xbuild ./src/GitVersion.sln /t:Clean /verbosity:quiet && xbuild ./src/GitVersion.sln /property:Configuration="Debug" /verbosity:quiet && mono ./src/packages/NUnit.ConsoleRunner.3.2.1/tools/nunit3-console.exe ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionCore.Tests/bin/Debug/GitVersionCore.Tests.dll ./src/GitVersionTask.Tests/bin/Debug/GitVersionTask.Tests.dll ./src/GitVersionExe.Tests/bin/Debug/GitVersionExe.Tests.dll --noresult --where "cat != NoMono" --noresult
+#