Revise multipart data upload API
Do not attach ?(null) if nil parameters on GET
Merge pull request #1 from mccannmax/master

Do not attach ?(null) if nil parameters on GET
Tag 1.1.1
Don’t use @import in public headers

Because Objective-C++ can}t hack it.

Tag 1.1.2.
--warning
Be safe, don’t potentially add nil to array

Analyzer is now happy.

Tag 1.1.3.
update from master