Switch gaia comparison view to 1.3

* Replace 1.2 with 1.3, and
* replace 1.1 with 1.2.
Improve CSS on changelog/credits page, outline active anchor
Merge pull request #167 from Pike/gaia-v1.3

Switch gaia comparison view to 1.3
Merge pull request #168 from flodolo/issue86

Improve CSS on changelog/credits page, outline active anchor