Minor change to MSBuild formatter to allow the error messages in a format Visual Studio can understand (not prefixed with >>) so that error messages are linked.

[deenairn]

This is to allow the error messages in a format Visual Studio can understand (not prefixed with >>) so that error messages are linked to the file in question. This is accomplished by not using the Grunt error output, instead performing a log.writeln (with the colour red) - to ensure that the messages still are prominent.

[palantirtech]

Thanks for your interest in palantir/grunt-tslint, @deenairn! Before we can accept your pull request, you need to sign our contributor license agreement - just visit https://cla.palantir.com/ and follow the instructions. Once you sign, I'll automatically update this pull request.

[adidahiya]

looks good, thanks!