refactor plotly integration, remove express, run testing with jest

.gitignore

@@ -1,2 +1,10 @@
 node_modules/
-yarn.lock
+dist/
+
+yarn.lock
+
+coverage/
+
+**/plotly.js/**
+
+**/*.tgz

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "printWidth": 120,
+  "trailingComma": "all",
+  "singleQuote": true
+}

.travis.yml

@@ -1,10 +1,11 @@
 language : node_js
 node_js :
- - stable
+ - 10.15.0
 install:
  - npm install
 script:
  - npm run test
+ - npm run lint
 
  # Send coverage data to Coveralls
-after_script: "cat coverage/lcov.info | node_modules/coveralls/bin/coveralls.js"
+after_script: npm run coverage

README.md

@@ -144,6 +144,17 @@ at `http://localhost:8080/data/:id`. After all pending plots are opened in a uni
 tab and all the data is requested, the server shuts down. If you fire another plot
 the server starts again provides your plot and shuts down automatically.
 
+## Contributing
+
+Contributions in all forms are welcome.
+
+## Developers guide
+
+Fork the [Github repository](https://github.com/ngfelixl/nodeplotlib) and clone
+it to your PC. Install the npm dependencies using the `install` command. It installs
+the dependencies and copies plotly types to project source. These won't affect
+the git tree.
+
 ## Get in contact
 
 - Check the [authors website](https://felixlemke.com)