[enh] Upgrade gulp plugins

package.json

@@ -7,7 +7,7 @@
     "url": "git@git.duniter.org:clients/cesium/cesium.git"
   },
   "scripts": {
-    "postinstall": "bower install --allow-root",
+    "postinstall": "bower install --allow-root && rm hooks/minify-conf.json hooks/uglify-config.json hooks/after_prepare/ionic-minify.js  hooks/after_prepare/uglify.js",
     "install-platforms": "ionic state restore",
     "start": "ionic serve",
     "docker:build": "sudo docker build . -t cesium/release",
@@ -72,7 +72,8 @@
     "gulp-css-base64": "^1.3.4",
     "gulp-csso": "^2.0.0",
     "gulp-filter": "^4.0.0",
-    "gulp-header": "^1.7.1",
+    "gulp-footer": "^2.0.2",
+    "gulp-header": "^2.0.7",
     "gulp-html-remove": "^0.1.1",
     "gulp-htmlmin": "^2.0.0",
     "gulp-jshint": "^2.0.1",
@@ -86,9 +87,9 @@
     "gulp-rev-replace": "^0.4.3",
     "gulp-sass": "^2.2.0",
     "gulp-sourcemaps": "^1.6.0",
-    "gulp-uglify": "^1.5.3",
+    "gulp-uglify": "^2.0.0",
     "gulp-useref": "^3.1.0",
-    "gulp-util": "^2.2.14",
+    "gulp-util": "^3.0.8",
     "gulp-zip": "^3.2.0",
     "ionic": "^1.7.16",
     "ionic-minify": "^2.0.8",