feat(conventional-changelog): add conventional-changelog gulp support

It's based on 0.0.11, a ticket is open to ask for the equivalent in 0.5.1 (conventional-changelog/conventional-changelog#117)

build/paths.js

@@ -11,6 +11,8 @@ const root = path.dirname(__dirname);
 export default {
   root : root,
   systemConfigJs : `${root}/system.config.js`,
+  packageJson : `${root}/package.json`,
+  changeLog : `${root}/CHANGELOG.md`,
   srcDir: `${root}/${srcDirName}`,
   releaseDir: `${root}/${releaseDirName}`,
   releaseDirName: releaseDirName,

build/tasks/conventional-changelog.js

@@ -0,0 +1,35 @@
+/**
+  * angularjs-jspm-seed
+  * Created by kdavin on 22/10/2015.
+  */
+import gulp from "gulp";
+import fs from 'fs';
+import cg from 'conventional-changelog';
+import util from 'gulp-util';
+import paths from '../paths';
+
+const argv = util.env;
+const from = argv.from, to = argv.to;
+
+// Conventional Changelog Generating Task
+// Can be use with '--from START_COMMIT --to END_COMMIT --version RELEASED_VERSION_NAME'
+// ex : gulp conventional-changelog --from 70a938f811256262b8411d9f05d91f600eac4123
+// it generate all the changelog from the commit id to today, it is useful to use the last commit id of the changelog.md
+gulp.task('conventional-changelog', function(cal){
+  function changeParsed(err, log){
+    if (err) {
+      return cal(err);
+    }
+    fs.writeFile(paths.changeLog, log);
+  }
+  fs.readFile(paths.packageJson, 'utf8', function(err, data){
+    var ref$, repository, version;
+    ref$ = JSON.parse(data), repository = ref$.repository, version = argv.vname || ref$.version;
+    cg({
+      repository: repository.url,
+      version: version,
+      from: from,
+      to: to
+    }, changeParsed);
+  });
+});

package.json

@@ -1,4 +1,9 @@
 {
+  "version": "0.1.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/davinkevin/angularjs-jspm-seed.git"
+  },
   "jspm": {
     "configFile": "system.config.js",
     "dependencies": {
@@ -21,6 +26,7 @@
     "babel": "^5.8.23",
     "browser-sync": "^2.9.11",
     "connect-modrewrite": "^0.8.2",
+    "conventional-changelog": "^0.0.11",
     "del": "^2.0.2",
     "gulp": "^3.9.0",
     "gulp-inject": "^3.0.0",