more restrictive semver for external dependencies

bower.json

@@ -19,12 +19,12 @@
   ],
   "dependencies": {
     "jquery": "~2.1.3",
-    "tweetnacl": "~0.12.2",
+    "tweetnacl": "0.12.2",
     "components-font-awesome": "^4.6.3",
     "ckeditor": "~4.7",
     "codemirror": "^5.19.0",
-    "requirejs": "~2.1.15",
+    "requirejs": "2.1.15",
-    "marked": "~0.3.5",
+    "marked": "0.3.5",
     "rangy": "rangy-release#~1.3.0",
     "json.sortify": "~2.1.0",
     "secure-fabric.js": "secure-v1.7.9",
@@ -33,11 +33,11 @@
     "chainpad-json-validator": "^0.2.0",
     "chainpad-crypto": "^0.1.3",
     "chainpad-listmap": "^0.3.0",
-    "file-saver": "^1.3.1",
+    "file-saver": "1.3.1",
-    "diff-dom": "^2.1.1",
+    "diff-dom": "~2.1.1",
-    "alertifyjs": "^1.0.11",
+    "alertifyjs": "1.0.11",
-    "scrypt-async": "^1.2.0",
+    "scrypt-async": "1.2.0",
-    "require-css": "^0.1.10",
+    "require-css": "0.1.10",
     "less": "^2.7.2",
     "bootstrap": "#v4.0.0-alpha.6"
   }