chore(yarn): use yarn and added missing typings file

.travis.yml

@@ -15,9 +15,9 @@ install:
 
 script:
   # remove unused node modules from cache
-  - npm prune
-  - npm install -g [email protected] [email protected] [email protected]
-  - npm install
+  - rm -rf node_modules
+  - npm install -g [email protected] [email protected] [email protected] yarn
+  - yarn
   - npm run test:ci
 
 sudo: required

dist/ObservableCollection.d.ts

@@ -1,3 +1,4 @@
+/// <reference types="chai" />
 /// <reference types="meteor-typings" />
 import { Observable } from 'rxjs';
 import { ObservableCursor } from './ObservableCursor';

package.json

@@ -20,7 +20,7 @@
     "build": "npm run build-only && npm run bundle && npm run docs",
     "prepublish": "npm run build",
     "build-only": "tsc || echo not ok",
-    "pretest": "npm run build && cd tests && rm -rf node_modules && npm install",
+    "pretest": "npm run build && cd tests && rm -rf node_modules && yarn",
     "test:ci": "npm run pretest && cd tests && meteor test --once --driver-package dispatch:mocha-phantomjs",
     "test": "cd tests && meteor test --driver-package practicalmeteor:mocha",
     "lint": "tslint src/**/*.ts",
@@ -40,14 +40,14 @@
     "rxjs": "^5.0.0-beta.12"
   },
   "devDependencies": {
-    "meteor-typings": "1.3.1",
     "@types/mocha": "2.2.33",
     "@types/underscore": "1.7.33",
     "conventional-changelog": "1.1.0",
     "conventional-changelog-cli": "1.2.0",
     "es6-shim": "0.35.1",
     "ghooks": "1.3.2",
     "jsdoc-to-markdown": "2.0.1",
+    "meteor-typings": "1.3.1",
     "rollup": "0.36.3",
     "rxjs": "^5.0.0-beta.12",
     "tslint": "3.15.1",
@@ -56,6 +56,11 @@
     "zone.js": "^0.6.22"
   },
   "greenkeeper": {
-    "ignore": [ "rxjs" ]
+    "ignore": [
+      "rxjs"
+    ]
+  },
+  "dependencies": {
+    "@types/chai": "^3.4.34"
   }
 }

typings.d.ts

@@ -1,3 +1,4 @@
 /// <reference types="zone.js" />
 /// <reference types="meteor-typings" />
-/// <reference types="@types/underscore" />
+/// <reference types="@types/underscore" />
+/// <reference types="@types/chai" />