(chore) Upgrade to node 6. Keep mandatory deps.

.travis.yml

@@ -1,11 +1,6 @@
 language: node_js
 node_js:
- - "5"
+ - "6"
- - "4"
-
-before_install:
-- npm install -g npm@latest
-- npm install rxjs@5.0.0-beta.6
 
 script:
 - npm test

package.json

@@ -31,10 +31,7 @@
   },
   "peerDependencies": {
     "@angular/common": "^2.0.0-rc.1",
-    "@angular/compiler": "^2.0.0-rc.1",
+    "@angular/core": "^2.0.0-rc.1"
-    "@angular/core": "^2.0.0-rc.1",
-    "@angular/platform-browser": "^2.0.0-rc.1",
-    "@angular/platform-browser-dynamic": "^2.0.0-rc.1"
   },
   "devDependencies": {
     "@angular/common": "^2.0.0-rc.1",