Changes for automated plugin release.

[maven-release-plugin] copy for tag xcode-plugin-2.0.16

[maven-release-plugin] copy for tag xcode-plugin-2.0.15

[maven-release-plugin] copy for tag xcode-plugin-2.0.14

[maven-release-plugin] copy for tag xcode-plugin-2.0.13

[maven-release-plugin] copy for tag xcode-plugin-2.0.12

[maven-release-plugin] copy for tag xcode-plugin-2.0.11

[maven-release-plugin] copy for tag xcode-plugin-2.0.10

[maven-release-plugin] copy for tag xcode-plugin-2.0.9

[maven-release-plugin] copy for tag xcode-plugin-2.0.8