Implemented workaround for rdar://14684188
Merge branch 'od/issue_496' into develop
add support for cascading classes
Merge pull request #544 from amro/add_cascading_css_classes

Add support for cascading classes
Added CSS Cascading unit test #544
Updated podspec version
Added bold and italic tests to #544 unit test
Merge branch 'develop' into release-1.6.4
Added 1.6.4 release notes link
Merge branch 'release-1.6.4'
Add support for cascading id and tag name in addition to existing cascading class support
Update unit test and remove log statement
performance improvements to cascade method
Merge pull request #545 from amro/add_general_css_cascading

Add More General Support for Cascading
background-color was being returned as an array. it is now treated properly as a string. i also applied the same fix for shadow.
Merge pull request #548 from amro/fix_bg_color_treated_as_array

Return background-color as a string instead of an array
check for unsigned int overflow
Merge pull request #549 from amro/fix_layout_index_oob

check for unsigned int overflow
Fix crash on encountering empty text block #550
Merge branch 'od/issue_550' into develop