Bumps version to 3.1.0 release

Merge pull request BetterCloud#64 from BetterCloud/tls-client-auth

Bumps version to 3.0.0 (release).  Fixes Javadoc issues.

Merged in 2.0.0-release (pull request BetterCloud#70)

Upgrades Gradle to 3.3, bumps version number to 2.0.0 (release)

Approved-by: Steve Perkins

Merged in pki-custompath (pull request BetterCloud#62)

Bumps version to 1.2.0 (i.e. release)

Bumps version to 1.1.0 release

Updates README.md to reflect current version number

Fixes version numbers in README.md

Version 0.3.0 release