Plone-app-imaging

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- Corrected ill-formed msgid that contained a double quote.
[hannosch]

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- Allow white space within image scale definitions.
This fixes http://dev.plone.org/plone/ticket/9207
[amleczko]

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- Refactor default scale handler to make it more reusable for the
blob-enabled version in `plone.app.blob`
[witsch]

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- Fix compatibility issue with Plone 4.0.
[witsch]

- Revert deferral of monkey-patching and traversal adapter registration
to package installation time.
[witsch]

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- Register traversal handler locally to avoid problems without the
corresponding monkey patch in place. Please see the second issue in
http://plone.org/products/plone.app.blob/issues/19 for more info.
[witsch]

- Replaced a getUtility with a queryUtility call in getAllowedSizes.
[hannosch]

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- Add fallback for determining available image sizes to avoid breaking
sites which haven't installed the package yet.
[witsch]