Merge pull request #18 from foghina/master

Add support for marginVertical and marginHorizontal
Merge pull request #19 from foghina/master

Add support for paddingVertical, paddingHorizontal, borderVertical, borderHorizontal
Minor fixes in improvements in Java code.
Merge pull request #20 from kmagiera/updates

Minor fixes in improvements in Java code.
Move isUndefined check to CSSConstants in java code
Merge pull request #21 from kmagiera/extractundefined

Move isUndefined check to CSSConstants in java code
Add jsr305, couple of @Nullable annotations