Added basic VoiceOver support to DTAttributedTextContentView.
Modified demo text view controller to hide non-visible content views to avoid conflicts with VoiceOver.
Invalidate accessibility elements when explicitly setting the layout frame.
Created view proxy for accessible attachments as subviews.
Merge upstream.
Re-added accessibility files to project.  Documented DTAccessibilityViewProxy
Documented DTAccessibilityElement.  Modified the designated initializer.
Documented layout frame accessibility element generator.
Added some comments.  Implemented hash/isEqual in view proxy.
Fix class parameter not being evaluated.  Code was checking against [DTImageTextAttachment class].
Added missing check for nil value sent to enumeration block.
Merge pull request #452 from leehericks/lh_textAttachmentsWithPredicateFix

Fix class parameter not being evaluated.  Code was checking against [DTI...
Bypass font enumeration if a DTCoreTextFontOverrides.plist file is provided

This fixes a performance issue. Retrieving all the system fonts is quite
slow; and although this is done on a background thread, the parsing will
block until the overrides table is built.

So, if a DTCoreTextFontOverrides.plist is found, consider it canonical
and don't build the overrides table dynamically.
Disabled stripping on non-Foundation DTCoreText lib
Update attributes property documentation.  Couldn't find where my custom attribute name got lowercased but it fits W3C recommendations and people should know if they use a camelcase name, it will be changed.
Added unit test for fallback font family
grouped font tests
implemented fallback font family
Merge pull request #467 from leehericks/lh_attachmentdocs

DTTextAttachment attributes property documentation
Merge pull request #459 from kemenaran/font-enumeration-override

Bypass font enumeration if a DTCoreTextFontOverrides.plist file is provided