Adds branching model descripton in contributing.
Adds changelog for all releases of library.
Fixes #1 of replacing last usages of jQuery.
Merge branch 'feature/dollarjquery' into develop

* feature/dollarjquery:
  Fixes #1 of replacing last usages of jQuery.
Merge branch 'develop'

* develop:
  Fixes #1 of replacing last usages of jQuery.