Add new(ish) twig functions to addons readme
Added ability to configure fuelphp root path
Add exnor to contributers
Bump version to v1.20
Bump copyright year to 2013
Update changelog
Merge branch 'release/1.20' into develop

* release/1.20:
  Update changelog
  Bump copyright year to 2013
  Bump version to v1.20