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.
cleaned up font matching

- with the override table generally filled there are now two modes of matching:
   1. by name (from the descriptor or override table)
   2. by doing a matching descriptor search
- when creating a descriptor from a font with slant matrix this also gets the italic trait
- much renaming and made clearer what is happening
Removed idiotic test code that - according to git blame - I am to blame for.
fixes #404
Merge branch '1.4.3'
Updated podspec for 1.4.3
Fix truncation line memory leak
Mode CSS attributes case-sensitive
closes #435
Added autoreleasepool to dictionaryOfCSSStyles to reduce memory usage
fixed category name, added headerLevel method
Set docs version to 1.5
Merge branch 'develop'

Conflicts:
	Core/Source/DTCoreTextFontDescriptor.m
Merge branch 'release-1.5'
Updated podspec for 1.5
hot fix for display size and original size bug
Created view proxy for accessible attachments as subviews.
Merge upstream.
Re-added accessibility files to project.  Documented DTAccessibilityViewProxy
Documented DTAccessibilityElement.  Modified the designated initializer.