Fixed key name in source map, added coffee file to map sources

These are the modifications I had to do in order to get source maps working
in 27.0.1425.2 (Official Build 185250) canary. I haven't tested other
browsers.

I first looked at the V3 spec and a few examples, and I saw that the
`source` key of the source map should be called `sources`.

After doing the `source` to `sources` change, the coffee source and for
some odd reason the javascript file would not show up in the browser
dev tools (it was being fetched but not evaluated).

To fix this, I had to add the coffee source to the `sources` list in the
source map file.

lib/coffee-script/command.js

@@ -397,6 +397,7 @@
     sourceMapPath = outputPath(sourcePath, base, ".map");
     jsDir = path.dirname(jsPath);
     compile = function() {
+      var generatedSourceMap;
       if (opts.compile) {
         if (js.length <= 0) {
           js = ' ';
@@ -413,7 +414,8 @@
         });
       }
       if (sourceMap) {
-        return fs.writeFile(sourceMapPath, sourcemap.generateV3SourceMap(sourceMap), function(err) {
+        generatedSourceMap = sourcemap.generateV3SourceMap(sourceMap, base);
+        return fs.writeFile(sourceMapPath, generatedSourceMap, function(err) {
           if (err) {
             return printLine("Could not write source map: " + err.message);
           }

lib/coffee-script/sourcemap.js

@@ -144,7 +144,7 @@
       version: 3,
       file: generatedFile,
       sourceRoot: "",
-      source: [sourceFile],
+      sources: sourceFile ? [sourceFile] : [],
       names: [],
       mappings: mappings
     };

src/command.coffee

@@ -279,7 +279,8 @@ writeJs = (base, sourcePath, js, sourceMap = null) ->
         else if opts.compile and opts.watch
           timeLog "compiled #{sourcePath}"
     if sourceMap
-      fs.writeFile sourceMapPath, (sourcemap.generateV3SourceMap sourceMap), (err) ->
+      generatedSourceMap = sourcemap.generateV3SourceMap sourceMap, base
+      fs.writeFile sourceMapPath, generatedSourceMap, (err) ->
         if err
           printLine "Could not write source map: #{err.message}"
   exists jsDir, (itExists) ->

src/sourcemap.coffee

@@ -146,7 +146,7 @@ exports.generateV3SourceMap = (sourceMap, sourceFile=null, generatedFile=null) -
     version: 3
     file: generatedFile
     sourceRoot: ""
-    source: [sourceFile]
+    sources: if sourceFile then [sourceFile] else []
     names: []
     mappings
   }

test/sourcemap.coffee

@@ -30,7 +30,9 @@ test "SourceMap tests", ->
   map.addMapping [1, 6], [2, 7]
   map.addMapping [1, 9], [2, 8]
   map.addMapping [3, 0], [3, 4]
-  eq (sourcemap.generateV3SourceMap map, "source.coffee", "source.js"), '{"version":3,"file":"source.js","sourceRoot":"","source":["source.coffee"],"names":[],"mappings":"AAAA;;IACK,GAAC,CAAG;IAET"}'
+
+  eq (sourcemap.generateV3SourceMap map, "source.coffee", "source.js"), '{"version":3,"file":"source.js","sourceRoot":"","sources":["source.coffee"],"names":[],"mappings":"AAAA;;IACK,GAAC,CAAG;IAET"}'
+  eq (sourcemap.generateV3SourceMap map), '{"version":3,"file":null,"sourceRoot":"","sources":[],"names":[],"mappings":"AAAA;;IACK,GAAC,CAAG;IAET"}'
 
   # Look up a generated column - should get back the original source position.
   arrayEq map.getSourcePosition([2,8]), [1,9]