Use yarn workspaces (#268)

Author: dmitmel

.gitignore

@@ -1,4 +1,5 @@
 node_modules/
 packages/*/node_modules/
-lerna-debug.log
-npm-debug.log
+package-lock.json
+
+*.log

.travis.yml

@@ -2,8 +2,5 @@ language: node_js
 node_js:
   - node    # latest
   - 6
-cache:
-  directories:
-    - $HOME/.npm
-script:
-  - travis_wait 15 npm test   # Increase "no output received" timeout
+cache: yarn
+script: travis_wait 15 yarn test   # Increase "no output received" timeout

lerna.json

@@ -1,4 +1,9 @@
 {
-  "lerna": "2.0.0-beta.30",
+  "lerna": "2.10.2",
+  "packages": [
+    "packages/*"
+  ],
+  "npmClient": "yarn",
+  "useWorkspaces": true,
   "version": "1.0.0"
 }