update dependencies

package.json

@@ -2,7 +2,7 @@
   "name": "phraseanet",
   "version": "4.0.0",
   "devDependencies": {
-    "bower": "~1.3",
+    "bower": "^1.6.5",
     "bower-files": "^3.11.3",
     "browser-sync": "^2.10.0",
     "del": "^2.1.0",
@@ -16,7 +16,7 @@
     "gulp-install": "^0.6.0",
     "gulp-qunit": "^1.2.1",
     "gulp-rename": "^1.2.2",
-    "gulp-sass": "^2.1.0",
+    "gulp-sass": "^3.1.0",
     "gulp-uglify": "^1.4.2",
     "gulp-util": "^3.0.7",
     "gulp-watch": "^4.3.5",