docs(readme): Extended description in Docs section

Couple of additions:
- Added docs on user defined port
- Added docs on testing canary & chromium builds
Changelog skeleton
Contributors skeleton
fix(readme): Typo in image path
* 'master' of github.com:dalekjs/dalek-browser-chrome:
  fix broken image
Added old changelogs
docs(contributing): removed outdated info on branching

- wip branch not needed
chore(dependencies): Updated outdated dependencies
Added new contributors
chore(gruntfile): refactored build to use dalek-build-tools