Merge pull request #58 from plotly/better-contributing

Better contributing instructions

Author: etpinard

CONTRIBUTING.md

@@ -5,6 +5,15 @@
 Search for existing and closed issues. If your problem or idea is not addressed
 yet, [please open a new issue](https://github.com/plotly/plotly.js/issues/new).
 
+Bug reports must be accompanied with a reproducible example. We recommend using
+[codepen](http://codepen.io/), [jsfiddle](https://jsfiddle.net/) or
+[jsbin](https://jsbin.com) to share your example.
+
+Note that GitHub issues are reserved for bug reports and feature requests only.
+Implementation questions should be asked on Stack Overflow (tagged
+[`plotly`](https://stackoverflow.com/questions/tagged/plotly)) or on
+community.plot.ly (tagged [`plotly-js`](http://community.plot.ly/c/plotly-js)).
+
 ### Development
 
 **Prerequisites**:
@@ -85,12 +94,12 @@ To view the results of a run on CircleCI, download the `build/test_images/` and
 ### Repo organization
 
 - Distributed files are in `dist/`
-- Sources files are in `src/`, including the index. 
-- Build and repo management scripts are in `./tasks/`
+- Sources files are in `src/`, including the index
+- Build and repo management scripts are in `tasks/`
 - All tasks can be run using [`npm run-srcript`](https://docs.npmjs.com/cli/run-script)
 - Tests are `test/`, they are partitioned into `image` and `jasmine` tests
 - Test dashboard and image viewer code is in `devtools/`
-- Non-distributed, git-ignored built files are in `build/` 
+- Non-distributed, git-ignored built files are in `build/`
 
 
 ### Coding style

README.md

@@ -44,7 +44,7 @@ Read the [Getting started page](https://plot.ly/javascript/getting-started/) for
 
 ## Bugs and feature requests
 
-Have a bug or a feature request? Please first read the [issues guidelines](https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md).
+Have a bug or a feature request? Please first read the [issues guidelines](https://github.com/plotly/plotly.js/blob/master/CONTRIBUTING.md#opening-issues).
 
 ## Documentation