exp/template/html: defines a parse context for a subset of HTML.
exp/template/html: defines a parse context for a subset of HTML.

This defines just enough context to distinguish HTML URI attributes
from parsed character data.

It does not affect any public module API as I thought I would get
early comment on style for defining enumerations and tables.

R=rsc, r, nigeltao, r
CC=golang-dev
http://codereview.appspot.com/4906043

Committer: Rob Pike <4dc7c9ec434ed06502767136789763ec11d2c4b7@golang.org>

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