Exports some internals and fix version bounds

[s9gf4ult]

Would be great to have this on Hackage.

[snoyberg]

What's the reason for the lower version bound bump?

[snoyberg]

If we're going to add new exports, they need to have Haddocks and @since comments. Can you add those, and do a minor version bump in the .cabal file?

[s9gf4ult]

Ok.

[s9gf4ult]

@snoyberg fixed

[s9gf4ult]

What's the reason for the lower version bound bump?

compilation error:

./yesod/yesod-core/Yesod/Core/Widget.hs:112:27-32:
    Could not deduce (H.ToMarkup TB.Builder)
      arising from a use of ‘toHtml’
    from the context (MonadWidget m, HandlerSite m ~ site)
      bound by the type signature for
                 toWidget :: (MonadWidget m, HandlerSite m ~ site) =>
                             TB.Builder -> m ()
      at Yesod/Core/Widget.hs:112:5-12
    In the second argument of ‘(.)’, namely ‘toHtml’
    In the expression: toWidget . toHtml
    In an equation for ‘toWidget’: toWidget = toWidget . toHtml

http://hackage.haskell.org/package/blaze-markup-0.7.1.1/changelog

- 0.7.1.0 
* Relax `QuickCheck` dependency to allow 2.9 
* Add text builder instances

yesod-core does not build without text builder instances, which is added since blaze-markup-0.7.1.

[psibi]

I remember seeing such an error in Travis in my PR yesterday: https://travis-ci.org/yesodweb/yesod/jobs/181651004#L438

[snoyberg]

Thanks!