* Show current version of docs in nav
* Branch in edit link
* WIP version selector
* An actual working but not pretty version dropdown
* update URLs for versions
v1.7: https://kubernetes.io/docs/home/
v1.6: https://v1-6.docs.kubernetes.io/docs/home/
v1.5: https://v1-5.docs.kubernetes.io/docs/home/
v1.4: https://v1-4.docs.kubernetes.io/docs/home/
* fix v1.4 and v1.5 paths
* Tidier drop downs
* Make font visible always
* Make background match main nav always
* change to major.minor version number
* show only major.minor version in drop down list
* switch from githubbranch to docsbranch
* update githubbranch
* update githubbranch values
* Border radius for bottom of dropdown
* Tabs are hard