JS backend: started to implement source maps

#KT-927 in progress

(cherry picked from commits 5543cda, 6ed296b, 11186f9, 5b84d0b)

compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java

@@ -153,11 +153,11 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
         EcmaVersion ecmaVersion = EcmaVersion.fromString(arguments.target);
         String moduleId = FileUtil.getNameWithoutExtension(new File(arguments.outputFile));
         if (arguments.libraryFiles != null) {
-            return new LibrarySourcesConfig(project, moduleId, Arrays.asList(arguments.libraryFiles), ecmaVersion);
+            return new LibrarySourcesConfig(project, moduleId, Arrays.asList(arguments.libraryFiles), ecmaVersion, arguments.sourcemap);
         }
         else {
             // lets discover the JS library definitions on the classpath
-            return new ClassPathLibraryDefintionsConfig(project, moduleId, ecmaVersion);
+            return new ClassPathLibraryDefintionsConfig(project, moduleId, ecmaVersion, arguments.sourcemap);
         }
     }
 }

compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompilerArguments.java

@@ -37,6 +37,9 @@ public class K2JSCompilerArguments extends CompilerArguments {
     @Argument(value = "sourceFiles", description = "Source files (dir or file)")
     public String[] sourceFiles;
 
+    @Argument(value = "sourcemap", description = "Generate SourceMap")
+    public boolean sourcemap;
+
     @Argument(value = "target", description = "Generate js files for specific ECMA version (3 or 5, default ECMA 3)")
     public String target;