Rather than keep a map that will have to be constantly updated every time
a new argument gets added to a compiler, the 'additionalArguments' option
will allow users to directly add arguments to the underlying compiler.
With this change, any referenced analyzer project will be parsed by the
project system and the assemblies will be passed down to the compiler.
By default, the analyzer language is considered to be "cs". If another
language is used, the "languageID" option should be specified inside the
"analyzerOptions" section of the project.json file.
Resolves#83
Provides a few benefits:
1) The new package has the correct dependencies listed, so I removed the
-MissingDependenciesOK flag from the crossgen scripts.
2) The new compiler supports -publicSign (formerly called "OSS sign"),
which I patched through dotnet-compile-csc .
