Merge pull request #21 from Esri/v100.15.6

Update for v100.15.6 release

Merge pull request #20 from Esri/v100.15.5

Update for v100.15.5 release

Merge pull request #19 from Esri/v100.15.4

Update for v100.15.4 release

Merge pull request #18 from Esri/v100.15.3

Merge pull request #17 from Esri/v100.15.2

Merge pull request #15 from Esri/sarat/u15.1

Merge pull request #14 from Esri/zach/U15

Merge pull request #13 from Esri/sarat/U14.1

increase Xcode Requirement in README

Merge pull request #11 from Esri/zach/U13.2