Fix for missing Font in iOS 7

Fix for missing Helvetica Neue Light font in iOS 7.0.x
Update DTHTMLElement.m
Move fix for missing font in iOS 7

Move the fix for missing HelveticaNeue-Italic font from DTHTMLElement to UIFont+DTCoreText
Removed xctool and appledoc forced install
Updated to DTFoundation 1.7.2
Fixed -newMatchingFont usage.
Fixed memory leak in -applyStyleDictionary: method of DTHTMLElement class.
Added override to use direct "PostScript" names for fonts
Merge pull request #805 from renssies/develop

Added override to use direct "PostScript" names for fonts
Added gradle build file for doc building
Merge branch 'master' into develop
Added missing reference in project file to DTCoreTextMacros.h #771
Force update of xctool
Updated DTFoundation static lib targets to include armv7s
Added armv7s to static lib targets
Determine image scale from difference between style attribute and decoded image size, fixes #816
comment sanity check
Fixed #816 fix for OS X
Added unit test file for #816 and removed two failing tests from Mac unit test
Updated to DTFoundation 1.7.3
Merge branch 'od/issue_816' into develop