Feedback to improve compileOnSave with tsserver.

I have implemented inside Eclipse `compile on save` with tsserver by consuming `compileOnSaveAffectedFileList` and `compileOnSaveEmitFile` commands. It works great but I think we could again improved it For `compileOnSaveAffectedFileList`: * `compileOnSaveAffectedFileList` should throw error when the given file is excluded of tsconfig.json. It will give the capability to display an error dialog when user wishes to compile a ts file which is excluded by tsconfig.json * in some case, tsserver `compileOnSaveAffectedFileList` returns *.d.ts files (see ttps://github.com/angelozerr/typescript.java/issues/190#issuecomment-317876026) those *.d.ts files must be ignored for compilation. For `compileOnSaveEmitFile`: * the reponse `compileOnSaveEmitFile` should return diagnostics errors. I had to call the two tsserver commands `syntacticDiagnosticsSync` and `semantacticDiagnosticsSync` after the call of `compileOnSaveEmitFile` to display errors in the Eclipse "Problem View" * the reponse `compileOnSaveEmitFile` should return the emited files path (js and *.js.map). In Eclipse case it's very helpful because I could refresh the files.