Merge pull request #282 from pwfisher/missing-package-json

Write package.json when unchanged but file was deleted. Fixes #247

lib/broccoli/fastboot-config.js

@@ -46,7 +46,7 @@ FastBootConfig.prototype.writeFileIfContentChanged = function(outputPath, conten
   var previous = this._fileToChecksumMap[outputPath];
   var next = md5Hex(content);
 
-  if (previous !== next) {
+  if (previous !== next || !fs.existsSync(outputPath)) {
     fs.writeFileSync(outputPath, content);
     this._fileToChecksumMap[outputPath] = next; // update map
   }