Update tokenizer to match spec

Update tokenizer to match spec

This CL is a rough pass over the HTMLTokenizer to align it with parsing.md.
We'll need to do another pass more carefully in the future, but this CL gets us
roughly in the right ballpark.

We're not handling EOF properly. The parsing.md spec doesn't push the EOF
though the parser, which breaks our current way of handling EOF. We do ok if we
get EOF in the DataState, and that's enough to pass the tests for now.

Also, update camel-case.sky to reflect the fact that the parser doesn't
lower-case tag names anymore.

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/adb2f5edbf8dcea52e9a50c270b1a1867e7bb7cb

[eseidel, 2014-10-28 03:42:06]

The CQ bit was checked by eseidel@chromium.org

[eseidel, 2014-10-28 03:42:07]

lgtm

[commit-bot: I haz the power, 2014-10-28 03:45:56]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-28 03:45:57]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[abarth-chromium, 2014-10-28 03:46:57]

Committed patchset #1 (id:1) manually as
adb2f5edbf8dcea52e9a50c270b1a1867e7bb7cb (presubmit successful).