Plone.app.blob

----------------

- Properly close written blobs in all `IBlobbable` adapters in order to
avoid `POSKeyErrors`.
This fixes http://plone.org/products/plone.app.blob/issues/43
[jbaach, witsch]

- Allow explicitly setting a mimetype via a keyword passed to the mutator.
[davidblewett, kleist, witsch]

- Don't raise `AttributeError` when calling `getSize` on empty images.
[ggozad, witsch]

----------------

- Correct blob migration count to ignore unrelated messages. This closes
http://dev.plone.org/plone/ticket/10114.
[hannosch]

- Update license to GPL version 2 only.
[hannosch]

-------------------

- Avoid deprecation warnings under Zope 2.13.
[hannosch]

- Test fix: Use the API to look at request headers.
[hannosch]

-------------------

- Fix deletion of blob-based content even if the field is not called 'file'
or 'image'.
[regebro]

- The `ImageField` could not be copied, which broke the standard way of
subclassing archetypes schemas.
[regebro]

- Migration screen tried to check for installation via quick installer. We
check the product of the destination portal type instead now. This closes
http://dev.plone.org/plone/ticket/10365.
[dunlapm, hannosch]

- Enable "Image" replacement content type by default.
[witsch]

- Don't break when image-specific methods are accidentally used on
"File" content.
[witsch]

-------------------

- Remove existing image scales when updating blob-aware image fields.
Fixes http://dev.plone.org/plone/ticket/10455
[frisi]

- Correct dependency on plone.app.imaging to >1.0b9 since we need the
new IImageScaleFactory feature.
[wichert]

-------------------

- Provide blob-aware factory for new-style image scales.
[witsch]

- Don't set the modification date of migrated content.
[rossp]

- Restore support for defining per-field image scale sizes.
Refs http://dev.plone.org/plone/ticket/10328 and
fixes http://dev.plone.org/plone/ticket/10159
[witsch]

- Provide base classes for file and image fields to be used in custom
types not based on `archetypes.schemaextender`.
Fixes http://dev.plone.org/plone/ticket/10328
[witsch]

- Drop workaround for broken index accessor handling, which has been fixed
upstream in `archetypes.schemaextender`.
[witsch]

- Don't try to determine image dimensions for content other than images.
Refs http://plone.org/products/cmfeditions/issues/58
[witsch, do3cc]