chore(deps): unpin RxJs (#84)

Because of the strict peer dependency on rxjs 5.0.1 I an unable to use this with newer versions of angular like 2.4.1 which have a peer dependency on rxjs 5.0.2.

Author: Pabreetzio

package.json

@@ -31,7 +31,7 @@
     "@angular/core": "^2.0.0",
     "@angular/http": "^2.0.0",
     "reflect-metadata": "~0.1.8",
-    "rxjs": "5.0.1",
+    "rxjs": "^5.0.1",
     "zone.js": "^0.7.4"
   },
   "devDependencies": {
@@ -67,7 +67,7 @@
     "rimraf": "^2.5.4",
     "rollup": "^0.36.0",
     "rollup-stream": "^1.14.0",
-    "rxjs": "5.0.1",
+    "rxjs": "^5.0.1",
     "tslint": "^3.15.1",
     "typescript": "~2.0.10",
     "vinyl-source-stream": "^1.1.0",