Support Layout overriding per HTML call
README, corrected example location of layout.
Adds a Redirect method to Render (with tests)

The motivation is to reduce the need to inject http.ResponseWriter and
http.Request parameters in most action handlers. Between HTML, Error,
and Redirect, render.Render should have everything needed to generate a
response.
Merge pull request #78 from blandbeard/master

README, corrected example location of layout.
Merge pull request #72 from vadimi/master

Support Layout overriding per HTML call
Merge pull request #80 from phopkins/render-redirect

Adds a Redirect method to Render (with tests)
Fixed broken test