update one more godoc.org link to godocs.io

more doc

more doc improvements

doc: guarantee no new analytics related to type aliases

clean up noisy details in docs

remove unnecessary slice conversion; update readme example; clean up

improve docs

fix generated code checks: comment should appear early in file (nisha…

…nths#29)

Account for this requirement:

This line must appear before the first non-comment, non-blank
text in the file.

http:https://golang.org/s/generatedcode

dot-imported package constants in case clause work correctly; improve…

… support for same-valued type alias constants (nishanths#28)

unexport IgnoreDirectivePrefix