Remove todos about addin usage to Pods.

Usage in Pods would be quite noisy when watching pods.
People should get usage from heapster, or from
some other object TBD.
Merge pull request #2362 from erictune/nousage

Remove todos about adding usage to Pods.
Fixes golint errors in pkg/api.
Point our docs at the releases page
Merge pull request #2370 from jbeda/doc-fix

Point our docs at the releases page
Merge pull request #2345 from yugui/lint/api

Fixes golint errors in pkg/api.
Added tool to generate initial auth config.