[dist] make tests work reliably, add package-lock.json

Author: jcrugzz

.gitignore

@@ -6,3 +6,4 @@ notes
 primus-proxy.js
 tes.js
 npm-debug.log
+.nyc_output

.travis.yml

@@ -1,14 +1,8 @@
 sudo: false
 language: node_js
 node_js:
-  - "0.10"
-  - "0.12"
-  - "4.2"
   - "6"
-
-before_install:
-  - travis_retry npm install -g [email protected]
-  - travis_retry npm install
+  - "8"
 
 script:
   - npm test