docs(Contributions): Update contributions page to something more accu…

…rate / up-to-speed with latest project directions

CONTRIBUTIONS.md

@@ -1,7 +1,17 @@
 # CONTRIBUTIONS
 
-Send a pull request with your code and the tests for it.
+The library lives and prospers thanks to you. If you want to share some of your work, or if you have fixed some of the 
+open issues, send a pull request with your code and the tests for it.
 
-Not mandatory at all but if you don't mind:
+We're currently re-organizing the project organization, and as such we're starting to adopt a stricter commit guideline,
+ very much inspired from that of [AngularJS](https://docs.google.com/document/d/1QrDFcIiPjSLDn3EL15IJygNPiHORgU1_OOAqWjiDU5Y/edit)
 
-* Prepend your commit message with `FIX:` or `NEW:`, make it easy to generate a readable CHANGELOG.
+So we ask you to respect 2 rules: 
+1. Provide the code, the tests, all respecting the style guide
+2. Follow AngularJS commit style-guide that can, at the most minimum, be summarized by a single line like:
+ `feat(solrCloud): Add ability to query pivot per field`
+
+Note: Please restrain from committing code that does other changes than what they are committed for. Avoid changing the 
+style guide of entire files while committing fixes or features.
+
+*Thanks in advance for your support in making the library live.*