fix cache issue for gulpfile

Author: Lukas Oppermann

AUTHORS

@@ -1,4 +1,4 @@
-   98	Lukas Oppermann
+  100	Lukas Oppermann
    90	Alexandru Badiu
    22	Ali Farhadi
     6	Jonathan Berger

gulpfile.js

@@ -105,12 +105,13 @@ gulp.task('bump-version', function() {
   if (v === undefined) {
     v = semver.inc(require('./package.json').version, 'patch');
   }
+
   return gulp.src(['./package.json', './bower.json'])
     .pipe(prompt.confirm(msg + v))
     .pipe(bump({version: v}))
     .pipe(shell([
       "git shortlog -ns master | awk '$1 >= 1 {print $0}' | cut -d' ' -f2- > AUTHORS",
-      "git add AUTHORS ./package.json ./bower.json"
+      "git add AUTHORS ./package.json ./bower.json && git commit -m'bump to version v"+v+"'"
     ]))
     .pipe(gulp.dest('./'));
 });
@@ -119,9 +120,9 @@ gulp.task('tag-version', ['bump-version'], function() {
   var args = minimist(process.argv.slice(3));
   var v = args.v || args.version;
   if (v === undefined) {
+    delete require.cache[require.resolve('./package.json')];
     v = require('./package.json').version;
   }
-
   return gulp.src('')
     .pipe(shell([
       'git tag v' + v