Add OutputPath to ProjectParserResult

[wwwlicious]

There currently isn't a good method to get a project output assembly from any of the build aliases.

An alternative is to return the outputPath from the project file using the ProjectParser.

Using this information together with the following it is possible to determine the output file generated by the project compilation.

ProjPath / OutputPath / AssemblyName [.] Type[Library|Exe]

[gep13]

Thanks again for your contribution to Cake!

[wwwlicious]

Thanks for merging, just haven't had the time recently to get this done!

[gep13]

@wwwlicious not a problem at all, so did all the hard work :-)