Added unit test for #742
Added font face setting techniques to programming guide #742
test case for #742
no longer erase font face name from font descriptor created by FONT tag #742
Only remove font face name when modifying font-style or font-weight during inheritance. #742

This allows usage of force font face name through the FONT tag.
disable font overriding for font descriptors with font face name set #742
Disable unit test for platforms that have no Helvetica Neue Light font face
Added bridging
Fixed typo
fixed #742 unit test for Mac. bold would get incorrect font
fixed #warning - was working after all
Removed assert, there are some cases apparently where family and face can be nil
Added new direct set test for UIFont and NSFont
Merge branch 'od/issue_742' into develop